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#1
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400 mains undersized
In need of undersized .001 main bearings.Who sells them street strip usage .Target clearance .002 ,now at .0035 -.004.Another question what is the total undersize is it .002 when using the .001 bearing as a pair or is .001
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
#2
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Quote:
Basically, here are your choices: 1 buy a bunch of different bearing brands and series of bearings which can get expensive. 2. Check the main housing bores and line hone to the minimum spec. That will generally tighten you up .0005". 3. Have your current bearings coated which will gain you about .001-.0015" but the coatings and application are often inconsistent. 4. Have the crankshaft ground to the correct size to allow -.010" bearings to be used with the desired clearance I have no idea what your plans are with this engine, but IMO, .002 is very tight on the mains unless the line hone and crankshaft are absolutely perfect. You will need 5W-30 racing oil also running that tight. It can be done but your window for marginal machining is really small. If it's a drag race engine, I would be OK with the clearance you have. Good luck with the build. |
#3
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The math will be as advertised. 001 total
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Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
#4
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Send them in and get coated and you will get your .001. Calico. I know they do rod bearings.
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#5
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The above is the best way to go about this and not waste hard earned money and lost race days!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#6
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I've used Calico numerous times. They have a std and thick coating, the thick coating will tighten up clearances 0.007"-0.001".
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#7
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My clearance from aft to front are .0022,0025,0025,0023,0033 the front bigger clearance may help the pending load from pulleys.or should i get it coated
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
#8
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FM 4040M1 for 3" main
https://www.summitracing.com/parts/slp-4040m1 I don't see .001" tighter listed for 3.25" main. As Mgarblik said, make sure the main housing bore is in spec and the crank journal is on size. You don't want to use an undersized bearing to crutch a separate issue.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 Last edited by chiphead; 08-12-2019 at 12:36 PM. |
#9
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Interesting that you have such a variation from front to back on your mains. I wouldn't worry about .0033 but I think .0022 is a little tight for a main bearing.
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Tim Corcoran |
#10
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I think you will be fine with those clearances for a street car .0022 is a little tight for a race application.
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Tim Corcoran |
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