clear2me Posted May 15, 2014 Share Posted May 15, 2014 Hi Do we need billet steel main cap for 3.2 or 3.4 stroker turbo ? Any one used it ? Thank you Quote Link to comment Share on other sites More sharing options...
Xnke Posted May 16, 2014 Share Posted May 16, 2014 Not unless you choose to run high RPMS....The stock caps seem to be just fine in big HP situations, but apparently the 8000+RPM motors SOMETIMES can break the main caps. I've only seen evidence of it twice, ever... Stock main caps with ARP main studs shouldn't give you trouble. Quote Link to comment Share on other sites More sharing options...
johnc Posted May 16, 2014 Share Posted May 16, 2014 "Billet" does not denote strength. Its mostly a marketing term now. The stock main caps are fine and I've run them to 8,000 rpm without issues using the V07 crank. Harmonic issues over 8,000 rpm (as mentioned above) can cause main cap breakage (if the crank doesn't fail first) but that is caused by improper balancing and/or a harmonic balancer not designed for those rpms. Quote Link to comment Share on other sites More sharing options...
clear2me Posted May 16, 2014 Author Share Posted May 16, 2014 Hi Thanks for all these info I will run 7500 RPM only Is LD28 main cap stronger than L28 ? Is good to buy new main cap ? I dont see parts number in google Is stock main cap with APR bolts save 100% on high boost like 25 psi ? Thank you Quote Link to comment Share on other sites More sharing options...
johnc Posted May 16, 2014 Share Posted May 16, 2014 Used caps in good condition are better then new. No difference between LD28 and L28 caps. No one can say how your engine will hold up under boot. The engine tune is far more important then the engine metallurgy. Quote Link to comment Share on other sites More sharing options...
clear2me Posted May 17, 2014 Author Share Posted May 17, 2014 Hi Thanks for these info So stock cap with ARP bolts will be fine ? Do you know about Nismo main bearing ? Thank you Quote Link to comment Share on other sites More sharing options...
1 fast z Posted May 21, 2014 Share Posted May 21, 2014 700+ RWHP on my twin cam, twin turbo motor spinning 8200 RPM, with stock caps. 7 mains helps a lot compared to other motors. Generally breaking main caps or lower blocks is from some serious detonation. Quote Link to comment Share on other sites More sharing options...
clear2me Posted May 23, 2014 Author Share Posted May 23, 2014 Hi That great used APR bolts ? Whats bearing you used ? Thank you Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.