Hello guys, a friend from our club offered my father and I a spare blower he had, for us to test and maybe buy it. The blower in question is a little Aisin unit, about 30c.i., adequate for lower displacement engines, so we decided to test it on a 134 Willys engine. My concern, is how much boost I can run on it? Based on a 1955 magazine article i know the Willys bottom end can take at least 8 psi, but that engine had custom pistons and reduced compression ratio, ours is completely stock. Would a low (4-5psi) boost, (which according to my math, keeps the compression ratio low enough for pump gas) be enough for the engine to survive, or without re-gapping the rings and other internal modifications i can forget the idea? Just for curiosity, this is the blown jeep from the 50's - bored and stroked to 151", some porting, a magneto, 5.5:1 CR and a 3-51 blower. Sent from my ASUS_X00DDA using The H.A.M.B. mobile app
You're talking the side valve and not the F head? 8 psi boot might be 200 HP? I believe if you can keep the RPM down it may live longer..
Yes, i'm talking about the side valve, we do have a few F head 6's, but i want to test on the smaller engine first On the power, i believe the article claimed 90hp at the wheels, so i would guess about 150 at the engine Sent from my ASUS_X00DDA using The H.A.M.B. mobile app
I don't know anything about that unit, or the 134. I looked them up, seems like a neat idea. I've run low or lower boost units on a couple motors. By low I means 4lbs on one and 7 on the other. Keeping the boost down to avoid detonation and the rpm down seems to let pretty stock engines live. This is for street driving, not staying in it for a full 1/4 mile or top end. The problem is even with low boost is you can feel it, and it's too damn fun to not use it.
The Willy is a low compression engine to start with, I have run 10 psi with a newer OHV engine that was around 9 or 9.5 on the street and it worked fine. But a much different engine,
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