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I,m running a reasonably stock 308 red with Quady and 4 into 1 extractors.It seems to be lacking some low down torque could this be the extractors.I have heard that the tri y,s give better low down torque on the 308.Can anyone shed some light on this.
cheers
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Yes for both questions. 4 into 1s suit high RPM for dedicated dragstrip and circuit cars. Goes well with single plane manifold.
Tri-Ys are better for the street and towing. Suits dual plane manifold.
James
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What you have heard is correct. Being a small stroke engine 308's are low on torque to start with (as compared to say a 305 or 307 Chev) and are affected by anything that affects low rpm torque eg single plane manifold, 4-1 extractors, big cam, big valves |
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What you have heard is correct. Being a small stroke engine 308s are low on torque to start with (as compared to say a 305 or 307 Chev) and are affected by anything that affects low rpm torque eg single plane manifold, 4-1 extractors, big cam, big valves, |
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A stock 308 should not lack power down low rpm.
some thing is wrong with it.
I have had, try's and 4 into 1. and the difference is F all. with a free flow exhaust. on a std 308.
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A stock 308 should not lack power down low rpm.
some thing is wrong with it.
I have had, trys and 4 into 1. and the difference is F all. with a free flow exhaust. on a std 308.
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Every stock 308 i've ever had or driven, including brand new examples, have been doughey down low COMPARED to longer stroke engines of the same/similar capacity. Just my experience.
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Every stock 308 ive ever had or driven, including brand new examples, have been doughey down low COMPARED to longer stroke engines of the same/similar capacity. Just my experience.
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do a compresion test on it....it might have a worn valve
...jetting might be out down low....Put a torque cam in it...
but I agrre with Byron above...there is a limit to how much torque you will get....the test is the two horse horse float up hill.
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Yeah thanks for the feedback guys.Its a pretty good engine no burnt out valves or anything like that.Its not a slug but I think that it could do with a bit more torque.I think I will look at putting on some try,s see how it goes.Or maybe just chev it.
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special k. Have you got a HZ with a T400 auto? that could the problem. they rob a lot of power.
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Agree. I actually remember the Motor or Wheels test on the HX Sandman at release. They tested a 308 manual van and a 308 auto ute from memory. They actually commented that the manual felt like it had a different engine and went like stick compared to the |
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On a 400 chev, I started off with single plane holley manifold and 4-1 pacemaker dump pipes into dual exhaust. The thing screamed like a banshee (would rev to 9,000rpm+), but would hardly get off the line. Changed from single plane to dual plane manifol |
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Its running a an m21 4spd and 3.08 gears.I thought I might change the manifold as well to an early type cause I think I have the later polution type.If anyone has one for sale let me know.
cheers
stuie
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If you have a later manifold chances are you have later heads and the early manifold wont fit.
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If you have a later manifold chances are you have later heads and the early manifold won't fit.
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Jabba says, On a 400 chev, I started off with single plane holley manifold and 4-1 pacemaker dump pipes into dual exhaust. The thing screamed like a banshee (would rev to 9,000rpm+), but would hardly get off the line. Changed from single plane to dual pl Edited by user Saturday, 3 May 2008 3:46:40 AM(UTC)
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Hehehe. I thought at the time that 9000+ might have been a mis-type.
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Nope. Not a mis-type. Had been originally built up as a nitrous breathing strip machine, running dart alloy heads and a 500+ lift cam, and lumenition optical electronic ignition with accel coil. When sold to the guy I bought it off, the dart heads and |
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I still think you should have checked the tacho wires to make sure it was reading a V8 and not 4 cyl revs.
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