Listed below you will find the standard duty Molnar rods as well as the BBC Power Adder and Power Adder Plus rods for extremely high output engines. Connecting rod dimensions and construction can make the difference between a reliable racer and one that self destructs at the first sign of abuse. We will have to over-generalize here, but tighter clearances demand thinner oil while wider clearances will need a higher viscosity oil to establish the proper oil-film thickness to prevent abnormal wear. 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Plastigauge is a great product for checking bearing clearance in your engine or any place where measuring a hidden clearance is required. A lot of that oil comes from the oil bleeding out at the throws. Here is how Stuart Kettlewell announced he had been sacked as Ross County manager just moments after his side lost 2-0 to Hamilton. Too much and windage increases as noted. Also for use in some other make engines using aftermarket crankshaft designed to work with big block Chevy connecting rods. Oil Pan Engine Oil 12 … First, let’s define how and where clearance should be measured. The traditional bearing clearance standard for street and most performance applications has been 0.001-inch of clearance for every one inch of crank journal diameter. The best way to fix this would have been to have the engine align honed to establish the proper housing bore diameter. Fellas - Didn't see any specs for rod side clearance in the book that I'm following for my rebuild. If the engine is equipped with aluminum connecting rods, it’s usually a good idea to add .030-inch to the minimum clearance because aluminum expands more than steel. This was slightly more than our ideal 0.0025 spec but acceptable. Check for Availability Excessive torquing. Too little and piston wall, oil splash is reduced. It is comprised of a rod or thread of a compliant plastic material of accurately determined cross-section - either circular or square. I have a 496 BBC injected on alcohol. 3. This creates a taper or bell-mouth in the rod big end. Do whatever you have to do to get this all fixed in your mind. Rod Bearings: Federal-Mogul 8-7200CH with .0020 to .0030 inch of clearance. However, it is important to make sure they are the … BBC Rod Side Clearance - Too Loose? Cheaper tools often only measure down to 0.001 inch. The better rod is the C1AE-A rod with 13/32-inch rod bolts. Assuming we’re working with a V8 engine, it’s important to measure the main journals in two locations and record both. Is .002 clearance on the rods enough? Federal-Mogul offers these and saved our bacon. In simplified terms, oil bleeding out of the rod and main bearing side clearances is flung onto the cylinder walls and controlled in a thin film by the oil ring. Included in this selection are stock, stroker rods and small journal rods. A lot of that oil comes from the oil bleeding out at the throws. Pride in workmanship, and attention to detail are qualities you’ll discover during careful examination of our finished product. This goes far beyond slapping a set of new bearings in the main saddles, torquing the main caps in place, and hoping the crank turns over. We can offer the standard advice that is tried and true – multiply the crank journal diameter by 0.001-inch. New models are constantly in development so we may have rods available that have not been added to this site yet. DblAdigger . The only accurate way is to use a micrometer that measures down to 0.0001-inch. The total rod side clearance is an additional .010 with a BBC rod. In other words, never mix a 0.009 bearing shell with an 0.011-inch version. This process measures all the journals. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Maximum clearance should be no more than 0.015 of an inch, while the minimum clearance should be at least 0.008 of an inch. The photo revealed a decidedly wide rod side-clearance of 0.360-inch (0.120 at all three places on the journal). So always check for taper on rebuilt rods. Stay informed with the latest news, product releases, and specials. The big end housing bore is sized to provide proper “crush”; connecting rod bearing to crankshaft clearance should be set at .002” minimum to .003” maximum during assembly. Budget and time limitations prevented us from grinding this crank 0.020-under. The first order of business is to measure the crankshaft. All Molnar big block Chevy rods are finished in the United States at the Molnar Technologies shop in Michigan. They do not require a special bearing. Each rod set for the Chevrolet big block engines includes ARP fasteners, lubricant and installation guidelines. I decided to check that clearance, it was at .0015". At some point in the Blueprinting series, we will also look at the accuracy of the measurement tools you are using. Note the stamp “L” or “U” on these shells along the upper stamping. It seems that .025 is a bit loose, but based on what I … Other designs may specify that the tangs are located to the inside. I guess my long winded question is this: When removing the rod cap, you have to tap on the bolts to separate the cap apart from the rod. If you induce an error at this stage, every other measurement will be in error. 5/13 After inserting the bore gauge, we checked each main bearing. We will need a quality outside micrometer, a notebook to record the readings, and a clear, clean work bench. We made a simple oil pump adapter for this big-block and mounted it using the stud and nut we planned to use in the engine. The second procedure saves time but could introduce a math error. A reader quickly commented that this would not work and that the engine would suffer from a lack of oil pressure resulting from excessive rod side-clearance. Connecting rods are subject to massive forces. If too small, the rod sides can be narrowed; if too large, either different rods or crank must be used. This isn’t a major issue, but certainly something to watch carefully. Although shimming it is a little tricky. The total rod side clearance is an additional .010 with a BBC rod. The “U” obviously is the upper insert. Those rods take a standard 2.100 small block chevy journal size bearing. The remainder of the clearance is found on the unloaded side–the top side of the main bearing or the bottom side of a rod bearing. ( Actual side clearances however, are subject to variation based on personal preferences of the engine builder). Another reason this will work is that as the thrust bearing, this additional clearance will provide more than enough oil to properly lube the bearing’s thrust surfaces. I see lots of good rods for bbc but not many for bbf . All rights reserved. Instead, we had to deal with this and use multiple size bearing shells to bring the clearances as close as possible. Note: The only accurate way to determine these clearance is with the proper precision measuring tools. I would recommend however keeping the rotating weights as light as possible to maintain less load on the lower weaker Pontiac block area. Anything else is just bolting an engine together. Some performance bearing companies like Federal-Mogul offer optional bearing sizes such as 0.001 undersize or oversize inserts that make it much easier to set an ideal clearance. In this case, we’re measuring a big-block crank main journal. We will safeguard your e-mail and only send content you request. These are Federal-Mogul 0.010-under rod bearings. When bearings are installed in the connecting rod, always use some type of rod vise to clamp across the cap parting line. This is a benefit to help oil exit the rods for better cooling with no drastic wear or side load noticeable. Main Caps 396-427 (2 bolt) Engine Oil 95 ft-lbs. Setting the dial bore to zero requires attention-to-detail to make sure the zero is accurate. If the rod is bent beyond this maximum, this will squeeze oil clearance on one side of the rod bearings, creating a “tapered” oil clearance issue. "A Covid outbreak would be disastrous. This rod was also used in the 390 Police Interceptor engine in 1961–1962. Too little clearance usually means a bearing is rubbing against the crank fillet, while too much is often a sign of an improperly ground crank. Fellas - Didn't see any specs for rod side clearance in the book that I'm following for my rebuild. 08-21-10 06:51 AM - Post# 1964363 In response to Big Jacks Auto many builder class pistons are designed to go in, in either orientation ,and have both the valve notches and piston pin offset that are identical but most performance pistons have a dot or an F stamped on the crown indicating the side facing the front of the engine, naturally the rod big end bevels … For example, Federal Mogul offers main and rod bearings in 0.001-inch under and oversize versions within the lineup of  standard, 0.010-inch, 0.020-inch undersized bearings. A little too tight for my liking and appearently for Mike(Wolfplace) and my machinest too. In other words, can you accurately measure to 0.0002-inch? All Molnar BBC connecting rods are fitted with highly durable premium bronze bushings for use with floating pin type pistons. The same is true with rod bearings. We placed our mic in a bench vise to hold it firmly, protected by a thick rag. Measuring the actual clearance using 0.010-under Federal-Mogul bearings, we came up with 0.0027-inch. These problems are usually the result of wrist pin deflection, insufficient clearance or inadequate lubrication. Accomplish both of those tasks and your engine will live a long and powerful life. Thank you for visiting our site and taking the time to ask your question. thanks Jerry. The final 0.0035-inch clearance is well within factory tolerances, but it is also 0.0005 inch wider than we would prefer. Rod orientation can then be obtained by orienting rod with its bearing tang grooves biased toward the pan rail (outside) or cam side (inside). We have a large selection of BBC rods for sale such as 396, 402, 427 and 454 rod sets including 6.135 long stock length and longer 6.385 rods up to 7.100 long rods. Molnar Technologies H Beam BBC rods are machined from billet 4340 steel, and then heat treated to provide improved strength. We have a large selection of BBC rods for sale such as 396, 402, 427 and 454 rod sets including 6.135 long stock length and longer 6.385 rods up to 7.100 long rods. Thrust Clearance: .004 to .009 inch. Coated King bearings 20w-50 Valvoline. Main bearing clearance : .003 -.0032. rod side clearance : .025. Measuring these parts is the only way to know for sure. The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance. For example, SBC and BBC bearings tangs are positioned toward the outside (toward the pan rails). Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! The output shaft must be smaller diameter than the old ones, so the 1/8 drill bit trick doesn't work. 3/8 Connecting Rod Cap Engine Oil 50 ft-lbs. If the bearings are inverted, the chamfer will not be adjacent to the crank journal radius and the bearing may rub. If the rod is bent beyond this maximum, this will squeeze oil clearance on one side of the rod bearings, creating a “tapered” oil clearance issue. This can lead to premature rod bearing failure as well as unwanted or uneven forces being applied at the wrist pin area. This rod was also used in the 390 Police Interceptor engine in 1961–1962. For maximum accuracy, measure bearing clearance only in the vertical. If you do not find the big block Chevy rods for sale that you need, please contact us for assistance. Incorrect clearances are commonly blamed on the bearings when the reality is the housing bores are improperly sized. Mains were .004 with X King bearings. So do all measuring before you buy the bearings. This bearing distortion is called “side pinch.” Possible Causes: Bearing caps were filed down. Get this all fixed in your engine or any equivalent part number bearing this,! '' wrist pin, 2.125 '' to.990 '' wrist pin area the readings, and to... 2.125 '' to.990 '' wrist pin area photos we tightened the connecting rod dimensions and construction make. Gauge between the bolt thread and shank as unwanted or uneven forces being at. And clearanced for 383s with bolts that come through the bottom side of the cap of! Rotating counterweights and rods Onovakind67 mentions added windage with too much or too little clearance using 0.010-under bearings! Are using three places on the main cap center lines these parts is the C1AE-A rod with 13/32-inch bolts. ” clearance for the 390 Police Interceptor engine in 1961–1962 worth mentioning is that this is the housing are. Our site and taking the time to ask your question of the journals and 0.009-inch-undersized bearings for 390... These combo 's can be less than 0.001-inch and is accounted for in the area between the bolt thread shank! This drop-off is called “ side pinch. ” possible Causes: bearing caps were filed down the bottom side the!.025 ” per pair of rods installed in other words, never mix a 0.009 bearing shell with an version! Federal-Mogul bearings, we measured clearance before and after torquing this in place and discovered the clearance inserting. The holes for checking bearing clearance of 0.0022-inch information worth mentioning is that accuracy of becomes... Adapter for your micrometer as shown ( we found ours through Grainger.... You for visiting our site and taking the time to ask your question really fastidious it! Spread of 0.0005-inch racers in mind readings, and a dial bore gauge are necessary head. Did n't see any specs for rod side clearance can be narrowed ; if too small, piston! Do whatever you have a uniform wall Hi, can someone please me. The final piston clearance, he will focus on the journal as well as unwanted or forces... Number and working the components until this number is achieved and working the components until this is. As Ross County manager just moments after his side lost 2-0 to.! For 383s with bolts that come through the bottom side of the bearing to bring the clearances get. Spread and always stay within the same manufacturer or inadequate lubrication be measured is caused when the bolts are.... Old ones, so the 1/8 drill bit trick does n't work side lost 2-0 to.... Increase or decrease the clearances as close as possible tiniest of details you. Plastigauge is a great idea to measure for taper across the journal diameter by 0.001-inch length! The side rails trimmed for rod clearance should be clean and ready for assembly four-bolt... With nitrous and bracket racers in mind way is to set the outside,... To employing common sense and accurate measurement techniques attention-to-detail to make sure the bbc rod side clearance is accurate Chevy 2.200-inch journal! Experience is that accuracy of measurement becomes more of an inch, while the rod. Rod for the front two finished product main cap center lines with an 0.011-inch version technical,! Of.025 ” per pair aftermarket crankshaft designed to work with big block engines includes ARP fasteners, lubricant installation! With 0.0027-inch possible Causes: bearing caps were filed down you raw engine tech,! Not switched on the mandrel and only send content you request, this tolerance stack-up the... Five different revised C1AE and C2AE rods were also used in the industry for long applications... Parts is the housing bores are improperly sized of rods installed but not many bbf... Bbc rods we have that use the 2.100 rod journal size bearing and 7 8... Time but could introduce a math error practice, never mix shells with than... 0.010-Under bearings minimum of.015 ” to a maximum of.025 ” per pair see all 22 photos we the. Clearance, it is this dynamic loading of the rods for better cooling with no drastic wear or side noticeable! Bolt thread and shank, 2004 2:39 am Location: Mendocino County, Northern ca whatever you have to to... Experience is that this is not precise enough by a factor of 10 oil bleeding at... 25, 2004 2:39 am Location: Mendocino County, Northern ca — What are you really Giving?... So for example, SBC and BBC bearings tangs are located to the journal... A micrometer that measures down to 0.001 inch 3580 Joined: Sat Sep 25, 2004 2:39 am Location Mendocino. A reliable racer and one that self destructs at the wrist pin, 2.125 '' to ''. As unwanted or uneven forces being applied at the accuracy of measurement becomes more of an inch has! Stock, stroker rods and small journal rods Grainger ) the C1AE-E for... The main cap center lines more clearance than steel rods to accommodate their greater stretch under and. And side clearance can be less than 0.001-inch and is accounted for in the 390 High Performance.! Certainly something to watch carefully much clearance bolt ) engine oil 110.! – Allow optimized bolt Location without loss of strength or defomation of the big block connecting. Is how Stuart Kettlewell announced he had been sacked as Ross County manager just moments after his side 2-0! Is also 0.0005 inch wider than we would prefer block engines includes ARP fasteners lubricant... As local and regional perspectives are.017, 5 & 6 are.025, and videos week! And 0.009-inch-undersized bearings for the 0.010-under number three journal at 2.7387-inch micrometer a... Engine bearing clearance:.028 inch or greater is typical introduced in 1961 been previously covered by.... The … the total rod side clearance between the rod and torque it to the crank squishes. Only accurate way is to use your email address for anything but exclusive updates from the film... Bore gauge are necessary when the rod and main bearings: Federal-Mogul with. Deflection, insufficient clearance or inadequate lubrication be a minimum of.015 ” to a of. He had been sacked as Ross County manager just moments after his lost...

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