B engine rods

[wyrmrider]

With a turbo as with anything, you want no detonation
quench helps you get there
I've run 50 lbs boost on Alky with tight quench and dished piston with wedge chamber
try a wedge head and find piston that works, several suggestions above about top thickness and pin location etc
I have no problem running pin through oil ring
I have bent BBC pins when running high boost so check pin support and use a good pin
long rod works better but camhas to match
short rod is tough as it makes it hard to minimize overlap and easier to blow boost out the exhaust

 

[dvw]

I disagree on the need for quench on boosted stuff. Weve found it to be unnecesary.
Doug

 

[wyrmrider]

full race maybe, race gas
but on the street it helps
we did have to reduce the squish area with high boost to keep from blowing the flame out
but quench could be any size
where the spark plug is and combustion chamber
make a big difference. BBM is worst
edit
I think it makes a difference if you are running above the torque peak
we also had lots of dyno time on this issue

 

[Paul Secoy]

I am pretty positive I won't exceed 15 pounds, and likely 10 will be plenty. I suspect a lot of the broken blocks I am seeing is due to detonation, not necessarily just related to a HP limit. I am hoping the mild compression and good fuel (E85) will help keep me out of detonation.

 

[dvw]

We run a stock block, stock cast crank 360. It makes enough power to run 142mph@3750. Hundreds of passes and plenty of street use. Besides sagging the centers of the 1st set of pistons it hasn't failed.
Doug

 

[wyrmrider]

great doug
most of my builds were motorhomes LA and B and BBC
you can make more top end hp with an open chamber but at the rpm range I ran they do not work as well, more critical on fuel and timing and compression
cheers