Where to go next for more power on TS 8v - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 8 (permalink) Old 10-31-2015, 08:21 AM Thread Starter
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Where to go next for more power on TS 8v

I've been building up an 8v TS for my GT Junior for a few years and finally got it on the dyno.

It's got a lightened crank, standard rods, Spruell JE pistons 10.5CR, total seal rings, it's on Jenvey 45's ITBs with an Emerald ECU and twin ford coil packs. Alfaholics inlet/exhaust. I can't remember which Cams I used, I recall they were Billet from Catcams and probably around 12mm lift, lost the specs :-(

The head still has standard valve sizes (44/38mm) but was CNCed by the guy who used to do the Illmor F1 engines, he also goes the Caterham CSR engines. The flow rates are as follows:

At 12mm life Baseline Exhaust (as he got the head) 75.8cfm, now 84.9, 12% gain, inlet was 98.9, now 117cfm, 18.3% gain. Going up to 15mm lift on the inlet, 123.8cfm was achieved (22% gain).

Power and torque graphs on the dyno attached, I was hoping for nearer 190bhp at the flywheel. Transmission losses on the graph seem quite low but not 20bhp too low...

However torque curve looks very flat and the graphs are really progressive, he said the fuelling is no where near maxing out. In his opinion the place to look for more power is with different cams and more RPM.

I have a set of Spruell Carello rods that could be put in on an evolution 2 build...
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post #2 of 8 (permalink) Old 10-31-2015, 08:22 AM Thread Starter
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Here's the graph flywheel corrected, max 150lbft and 178bhp
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post #3 of 8 (permalink) Old 01-02-2016, 01:42 PM
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c&b cams, kent springs, and the spruell conrods should help out a lot...
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post #4 of 8 (permalink) Old 01-03-2016, 01:21 AM
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conrods will not bring HP... unless you use them to raise the CR.
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post #5 of 8 (permalink) Old 01-03-2016, 03:01 AM
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Quote:
Originally Posted by Zander z28 View Post
c&b cams, kent springs, and the spruell conrods should help out a lot...
A very controversy opinion to use C&B instead of the right one´s from CatC or to time them accurately....which # CC cams are you currently using ?

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post #6 of 8 (permalink) Old 01-03-2016, 06:47 AM
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conrods will not bring HP... unless you use them to raise the CR.
Correct, but the sticker you get with the rods is worth an easy 10HP!
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post #7 of 8 (permalink) Old 01-03-2016, 07:07 AM
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Maybe RJR cams. Which cams you use now? AH you said but what are the specs?
Bigger valves no use, not only the opinion by RJ, but confirmed and explained to me by a top dutch engine builder with much experience on TS tuning.
CR should go to around 11 or even 11.5 .
The clue is probably in the right combination of CR and cams.
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post #8 of 8 (permalink) Old 01-03-2016, 11:38 AM
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The conrods are for higher compression... obviously compression needs to go up... easy way to do that is milling the bottom of the head
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