Quote Originally Posted by southside
In that case why do gsrs have girdles and what would be the safe max rpm for stock ls rods and bolts.
the question is why DOESNT the ITR have a girdle?

honda has a tendency to over engineer sometimes, and its been proven on STREET motors the girdle does little to nothing at all for high RPM stability. They only matter when the stroke gets really big like over 90mm. Hence why the F23s (hondas 95mm stroke) had 5 bolt main girdles.

My LSVTEC revved to 9700 all day with no girdle and Don Flores said it didnt need one, im not one to argue with him. However on someone elses 95mm stroker motor he had a custom 5 bolt main girdle put in.

Honda decided to counter balance the ITR crank a different way an opt NOT to use the girdle in the Type-R. The Type-R revs 900 rpms more than the GSR.

But FYI, both GSR and ITR rods are good for 9000rpms stock.

LS rods, 8000rpms MAX