RPM

General engine tech -- Drag Racing to Circle Track

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racer111
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Post by racer111 » Mon Sep 05, 2005 1:07 am

So how hard should I spin a motor built like this.
SBC 400 stock style 4 bolt main deburred inside, 5140 CAT 350 storke crank with spacer for bearings, Eagle ESP 6 in H rods, Probe pistons.

bsfc9

Post by bsfc9 » Mon Sep 05, 2005 10:35 am

What heads, valve train, cam, piston weight?

racer111
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Post by racer111 » Mon Sep 05, 2005 1:49 pm

Vortec heads, Stainles Steel roller rockers, Comp studs & push rods, Comp Cam 532I 540E, 443 grams.

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Post by ou812 » Mon Sep 05, 2005 3:35 pm

Only way to be sure if to run it from a base point like say 6000rpm, then shift at 6400 and so on till the car slows down. Then go back and from there till ya run the best times. Ultimately you need to know the rpm the cam is intended, and what the springs will hold up to. Is it hyd cam or what? Any porting to the heads? We need alot more details...

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Ken0069
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Post by Ken0069 » Mon Sep 05, 2005 4:32 pm

I think what you are looking for is how much abuse this stock block will stand. That being said, compression will be a major factor in how it will hold up. I've seen a shit load of these blocks come apart because the cylinder walls collapsed/blew out from combustion pressures. I've got a 434 built in a stock block with billet steel caps and Cola crank but compression is at or near 10.5 to 1. Engine still makes around 600 hp and I turn it over 7k on a regular basis. I am sure though that the only reason it's still together is because of the low compression. The engine was built back in the early 90s as a Pro Street engine and will run on pump gas. It was street driven and has about 4k miles on it along with many passes at the race track. Hope this helps.

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Post by oldhead » Mon Sep 05, 2005 11:03 pm

I was using Pat Musi's dyno back in 2002, with a mild 400 production block steel rods, crank & main caps,871 blower and just made 748 hp. at 6800,then Pat said you better stop or you will pull the block apart...So I went home, soon sold the block to a freind, who went back to the same dyno, increased the boost, made 809 at 7000...Put more then a 100 runs on it, sold it to a freind, who put a 671 & 250 of nitrous....hes gone faster then us with a guess about 950 hp.....None of the owners have gone more then 7300........By the way it's had a sleeve in it all this time...OLDHEAD
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