Just want to give a special thanks to John Mummert for all the help, parts, heads, advice and info he has donated to this project.

Here is the proof of the nasty runs. Me and the guys are stoked right now and having a Crown Royal to celebrate. I hope you enjoy this y-block vid as much as I do!!!

http://www.youtube.com/watch?v=a8oahapp6D4

With a calculated 30% drivetrain loss we are at 787 crank hp.. It could very well be more drivetrain loss than that though with 35" mud tires, a transfer case, auto trans etc..

It probably is the most for a street vehicle. I think Randy Gummelt has the record with his dragster. It was far in excess of 700hp, I want to say 770 at the crank.


Lawrenceville, GA

BOOM, as in we just made 600 whp with a 50+ year old engine for the first time to our knowledge. As far as we know no one has hit those numbers. Stock block, stock main caps and main cap bolts, steel crank, probe pistons, scat rods, badass Mummert intake and some sweet touched up heads by John Mummert!! E85 and 22psi Twin HE351CW from 06 Cummins.

What a motor. BOOM? you didn't blow it up?

Hope not.

Enjoy
Jim

  Jim Rowe Elkhorn, NE

Well talked to the guys at ngk and they suggested opening the gap. Tried that and got very worse. Closed gap to .020 and this is what happened.



This thing has not run better it is really happy at 607 whp and 750 lb/ft of torque @ 22psi!!!! BOOM!

Couple ideas.. As boost pressure goes up you may need to use a little stronger valve spring.. I have heard of premature valve float with high boost pressures.. Also you are starting to build really high cylinder pressure It could be that your ignition needs more energy to provide a good spark

That's some pretty serious power right there.


Lawrenceville, GA

Well we were able to make a few dyno runs. When we would get to about 17 psi it would pop sometimes. So we put in a colder spark plug went from BR7EF to a TR8IX. It got better but didn't quit completely. I think i'll call ngk in the morning and see if there is a colder plug. Once we back the boost down to 14 psi or less it works great. If anyone has any thoughts that would be great. I don't know if it would have anything to do with vale springs or what, but it is directly related to boost pressure once we hit 17psi or highter it will do that. I will let you know what I find out. Here is the graph we got so far. Laying down so nice torque!