Time is up....
This little guy made 535 hp @ 7400 rpm, with 454 lb-ft of torque. Pulls were to 7800-8000 rpm.
Who was the closest without going over?
Nice numbers.
What did it have for compression and what fuel did you run?
With your tighter bearing clearances, were you running a 5-30 oil, or 10-40?
I've had a set of new BME 6.795" (426 series) rods setting around for years. Some day I'm going to have to build an engine around them. A 460 BBF.... maybe something like a 508 (4.42x4.14). I have the off-set ground 4.14 crank and a 3.85 steel truck crank for a 472". I got them off BME's "Over Stock" page about 10 years ago for about 1/2 price.
Alumi rods still make people nervous. Bill (BME) told me " Don't listen to them"
It had 10.59:1 compression and we ran 112 Sunoco. I think we would have benefitted from a pump gas mix and I will try that when we go back. The exhaust ports were a little on the sooty side. It has a lot of cylinder pressure due to the cam being so advanced, so I really didn't know what I could get away with. We played it safe the first time and I can back into something else on the next session.
I ran 5W-20 oil. Some of the rod bearing clearances were .0018-.0019". It completely makes sense to me to set them up a little tight, since aluminum expands so much. We just gave the engine ample time to warm up.
I pulled the pan off the other day to change the rear main seal and the timing cover seal to a double lip/teflon setup for a vacuum pump addition. I checked the bearings while I was in there. You can still see my mic tracks.
Aluminum rods do make people nervous. This engine is gonna go in a street car after I thrash it on the dyno for awhile. It will keep the aluminum rods.
I attribute the horsepower to a really nice set of heads, a well-chosen camshaft, and some careful measuring and planning. Tight quench with a little engine that pulls hard on the ports.