09-22-2012, 04:48 PM
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#41 (permalink)
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And we rarely get above 2000-rpm (heavy payload or heavier trailer and/or hilly starts or mountain grades).
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09-22-2012, 05:55 PM
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#42 (permalink)
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Master EcoModder
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I was thinking since you measure to length from the valve to a protrusion/hard surface to reflect the pulse wave you could build the intake similar to the exhaust. Build the mounting bracket to the heads then bend the first stage pipes till they all meet the same point where they blend together into a larger pipe and that pipe works its way back to the turbo making that the first surface it sees allowing for a longer runner length.
Literally it would be like running a tuned length exhaust manifold on the intake.
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12-29-2012, 10:11 AM
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#43 (permalink)
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Do more with less
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On an IDI turbo engine how does all the air get through the small holes in the pre chambers and what effect does that have on intake tuning?
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
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12-30-2012, 12:58 AM
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#44 (permalink)
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Corporate imperialist
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Quote:
Originally Posted by Varn
On an IDI turbo engine how does all the air get through the small holes in the pre chambers and what effect does that have on intake tuning?
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None. You don't have to worry about the small pre cup hole until after the intake valve is closed.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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12-30-2012, 10:02 AM
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#45 (permalink)
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Do more with less
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Had a brain fart. Of course the intake valve isn't in the pre chamber.
Thanks
__________________
“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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12-31-2012, 06:35 AM
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#46 (permalink)
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Banned
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Did somebody say small prechamber hole?
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01-07-2013, 01:25 AM
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#47 (permalink)
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Corporate imperialist
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I think those pre chambers would be good for smoother starts and quieter running but I have a feeling they could increase pumping losses.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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08-28-2021, 03:05 PM
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#48 (permalink)
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Corporate imperialist
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I was looking at another practical application for super volumetric efficiency. My riding lawn mower.
Using an on line calculator it looks like the intake runner is perfect size and length to capture the 4th harmonic pulse at its rated speed of 3,500rpm.
None of these on line calculators existed 20 years ago when I first published the super VE chart so it appears to work.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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