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360 on the dyno

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WesternRed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jan/31/2019 at 7:04am
I watched that also, another good example of air-gap style manifolds supporting a fair bit of horsepower. I did like that Weiand seems to have put a bit of thought into their intake rather than just making another air-gap clone, even if is was made in China. Not made for AMC applications of course.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sonic Silver Quote  Post ReplyReply Direct Link To This Post Posted: Jan/31/2019 at 9:33am
Originally posted by jcisworthy jcisworthy wrote:

I noticed. 

I could have tried stagger jetting on the air gap but did not for this engine. I also could have added some jet to the torker which I did before that pull and it got the air fuels pretty close but still a little lean.  

Increasing two jet sizes in the primary and three sizes on the pull before the one posted picked the engine up around 10 on both ends.  

More jet and a spacer would probably have picked up 10-20 more hp and torque but there is no room for a spacer in this application and another 10 or so would not have made up the difference so I left it as it was.

Time was running out because I had made an unexpected intake manifold change on the dyno. 

The air gap dyno test was done a few months ago and the Offey / torker testing was a few days ago and weather conditions were very different. 

The dyno has a correction factor for all conditions so the numbers should be good but a better test would have been to add the air gap the same day and test again.  


Even though the Air Gap testing was done at a different time, all 3 manifolds were basically equal in horsepower at 2,500 rpm. From that point on to 5,500, the Air Gap picked up 40 horsepower on the Offy and 20 on the Torker. If you had tested the Air Gap on the same day, you wouldn't think it would be way down to the other 2 at 2,500, would you? Above that it pulled away.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Jan/31/2019 at 5:24pm
Thank you John for taking the time to do this stuff and then making it public for everyone.

 Even though I bought an RPM for a mild 401 build, I had pretty much made up my mind that it would cost power vs a Torker,
 glad to see that may not be the case.
 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jan/31/2019 at 7:02pm
Here is the old test that Ken Parkman did on the Air-Gap vs the Torker that he mentioned earlier in this thread. In this instance the Torker pulled ahead from around 4,500 RPM, but not really much in it.



I think it just shows that it's not cut and dried, every engine is going to be different and we are just fortunate that people have taken the time to test these things.
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