Feedback Score: 9 reviews
Join Date: Aug 2004
Location: Barnesville, PA
VFJ 750cc std bore testing
Got the std bore setup installed last week and did some testing. I was happy it was the highest HP std bore kit I've done to date. Just a bolt in kit, pistons, custom grind cams, valve springs, PCV, Muzzy duals. stage 3 spidermod clutch, Stock heads no porting or decking, stock cylinders, no decking or surfacing, stock valves, stock throttlebody.
~65.6 average RWHP. and it holds the HP line above 60 rwhp all the way to 60 mph.
while this is great. I feel like I can get even more RWHP out of this setup. Before we add ported heads, 38mm throttlebody. I feel that would get us over 70 rwhp right now. but I don't want to have the added expense and time down for porting and bored t/b as I believe the power is there without it. well see....
also, the torque is up more than the other kits I've tested as I do not require insane RPM's to make the power. We are only shifting out at 7600 rpm making this power to the wheels.
There is NO dead spots in the lower rpm range, common with some other setups, there is ZERO lag hitting the gas. it takes off like a ROCKET and literally hits 50 mph in about 4 seconds.
So....it's going back to testing with some additional cam profiles and possibly a zero gap secondary ring package instead of the zero gap top ring package.
While this setup may have made the best RWHP to date of any bolt in std bore setup that I've tested, it didn't make close enough to the 70 rwhp with a bolt in setup like I wanted it to.
ALSO. we did not drill and tap ANY additional venting for the crank case and running the vent hose to the airbox like stock. NOT A DROP OF OIL IN THE AIRBOX!!
I'll post up the charts later I have to get them off the dyno computer and I have 4 clutches to finish to go out today.
just a heads up, the std bore kits are working, but not 100% finished to my liking yet.
Last edited by VFORCEJOHN; 07-02-2012 at 12:50 PM.