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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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How much HP can i make with these mods....Views : 2037 Replies : 33Users Viewing This Thread : |
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May 20th, 2024, 00:07 | #21 |
Jack Owen
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I've been looking at a few camshafts, a H profile camshaft with 12mm lift and about 272 duration.
The other is a 12.9mm lift with 300 degrees but that seems over kill. If i'm running with Millers 0w-20 oil, do you think i should be okay running a high lift cam with such low viscosity oil or will i need something thicker ? Last edited by volvo B230ET; May 20th, 2024 at 00:11. |
May 20th, 2024, 10:45 | #22 | |
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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May 20th, 2024, 15:04 | #23 | |
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Avoid the IPD cam and the T25 cam that classicswede sells, both have multiple reports of lobe wear despite the correct running in procedure being followed. Chinese steel junk!!! The T25 is total crap anyway due to it being a dual pattern cam with smaller lift/duration on the exhaust side.
Stick with OEM or Swedish made cams from Enem or KG Trimning.💪 V15 Turbo V16 Turbo https://www.kgtrimning.org/tuning-sp...234/camshafts/ Having said that, especially with an auto you want a torquey cam that performs best under ~5500 rpm, so the T or M are the ticket. A T cam also performs well with a manual: Quote:
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May 20th, 2024, 15:16 | #24 | ||||
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May 20th, 2024, 18:03 | #25 | |
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In any case, what is up with that ignition advance? You are firing the spark 2 degrees after top dead center. At high RPM the flame front has less time to propagate, you are effectively wasting efficiency there and possibly transferring all that heat out the exhaust I think. My research would tell me this is the perfect way to blow up an engine. In fact my research tells me you will either burn/drop a valve or melt the turbo. As the negative timing acts like anti lag pushing the explosion not in the combustion chamber but out in the exhaust manifold. And furthermore it is so rich, the EGT temps are very high possibly. There was also no mention of your piston ring gaps. In any case, porting really will help you here. Not just head ports, but also valve bowl area. Additionally, a few more valve angles may not be a bad idea. Last edited by mcfe; May 20th, 2024 at 18:10. |
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May 20th, 2024, 19:00 | #26 | |
Jack Owen
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With the new intercooler fitted i'm going to monitor the intake temps and adjust the boost accordingly until the intercooler can no longer keep the boost temps linear, I should see 34C at 17 PSI of boost at full throttle, but that is on paper. Piston ring gaps..... they're the same as standard specs We took a risk and put the engine together with very tight clearances so we can run with an oil with low viscosity hoping we can disperse the excessive heat well, so far after a thrashing the oil sits at 97C. Last edited by volvo B230ET; May 20th, 2024 at 19:21. |
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May 20th, 2024, 19:33 | #27 |
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Ah ok, those timings look normal.
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May 20th, 2024, 20:01 | #28 | |
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Oil wise i would honestly stick with 10w40 |
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May 21st, 2024, 08:38 | #29 |
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Overlap is usually avoided on turbo cams. Too much overlap and you get reversion as well, which sounds very counterintuitive but it happens. Also, you get a small boost loss as during overlap you are pushing some of the mixture away from the combustion chamber and out into the exhaust.
On NA engines cams, overlap helps especially with proper intake and exhaust manifolds to take advantage of exhaust scavenging. |
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May 21st, 2024, 21:07 | #30 | |||
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Found the video that a guy posted with a Motronic build. Spec on it was a rebuilt B230ET, ported and polished 531 head with 38/46 valves, V16 cam, 3" exhaust, BSR chip, and 14 psi. Stock everything else.
That is slower than my car with an M cam on a 13c at 13 psi.🤣 So we can conclude that just sticking a cam in won't make it any faster. Found the dyno sheet he posted and as you can see it leans out up top. Like an idiot he kept driving it like that for a couple of months, and together with too tight a valve clearance (and/or them not being up to the job), the valves failed and totalled the engine.
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