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Old 09-02-2010, 09:22 PM
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Quote:
Originally Posted by Uncle Buck
Here's the problem I keep running into: if I bring quench to something acceptable I drive CR up
Yeah, but what you gain in squish far surpasses the additional SCR.

You may or not know that I run quite a few DynoSim software programs and have been doing so for a while. I really enjoy it. Well, anyway, I had this one in storage, so I pulled it out to post the results here.
331 (0.030"+ 327)
L31 heads
9.00:1 SCR
600 carb on standard Performer intake
1 5/8" long tube headers
CompCams 12-234-2 cam. I don't like suggesting flat tappet cams anymore, but you could use these timing numbers to have a cam grinder cut a roller for you.
http://www.summitracing.com/parts/CCA-12-234-2/
These pistons make 9.0:1 with a 64cc chamber and have a nice, wide squish pad....
http://www.kb-silvolite.com/kb_car/p...etails&P_id=43
RPM HP TQ
1500 90 314
2000 140 368
2500 187 393
3000 225 394
3500 267 401
4000 304 399
4500 332 387
5000 347 364
5500 341 326

Pulled the heads off, replaced them with Racing Head Service cast iron Pro Torkers, 170cc intake runners, 64cc chambers. Installed 1.6 rockers int and exh. Pulled flat tappet cam out, installed hydraulic roller retrofit, Crane 119811, installed straight up. All else the same.
http://www.summitracing.com/parts/CRN-119811/
http://www.summitracing.com/parts/RHS-12410-01/
RPM HP TQ
1500 95 334
2000 145 381
2500 193 404
3000 232 406
3500 272 408
4000 303 404
4500 335 391
5000 350 368
5500 352 336
6000 312 273
Torque curve is as flat as a table. The 1.6 rockers only added a few hp and a few ft/lbs. I probably knew that before running the combination, but did it for grins. Not worth it if you don't have them on hand and have to buy them. Use 1.5's.

If you would like to research other ways of controlling detonation, google for "Singh grooves".

Last edited by techinspector1; 09-02-2010 at 09:42 PM.
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