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1 5/8 GRACE MANIFOLD VERSUS 1 3/4 KUSTOM HEADER |
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jtsllc1 
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Joined: Sep/24/2013 Location: ORFORDVILLE WI Status: Offline Points: 1037 |
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 Posted: Jul/14/2014 at 11:14pm |
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JTSLLC1
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jtsllc1
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Posted: Jul/14/2014 at 11:34pm |
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Adkins suggested putting the dog leg in since the exhaust will flow better... So I guess the dog leg makes a difference even on a trapezoid head... These Trapezoid will flow enough to be able to use the 1 3/4 Grace Manifolds...
Adkins will be developing the 2 ports then Galto Racing will be digitizing and 5 axis machining the rest of the ports to match..
I have reserved flow testing at Galto Racing on Thursday to test the EFI intake converted to Carb attached to a ported head and then we will test a Torker reworked by Adkins just to see a comparison... Final test for the EFI intake will be an E.T. test ...Bob looks forward to putting it on his car.. If the manifold works Galto will be able to digitize and duplicate the intake... |
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JTSLLC1
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jtsllc1
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Posted: Jul/15/2014 at 12:02am |
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JTSLLC1
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jtsllc1
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Posted: Jul/15/2014 at 12:04am |
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Intake roughed in with carbide burr..to be finished by Thursday's flow test...
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JTSLLC1
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jtsllc1
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Posted: Jul/15/2014 at 12:05am |
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JTSLLC1
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jtsllc1
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Posted: Jul/15/2014 at 9:49am |
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JTSLLC1
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Rogue401
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Posted: Jul/21/2014 at 5:36pm |
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Boris Badanov
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Posted: Jul/21/2014 at 5:41pm |
The spreading of the floor of the port is all for the Coanda effect. The pressure drop caused by the increases in area sould in theory make the slow side of the port get a high percentage of the flow than it normally should. It's why the dog leg port is so good.
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Gremlin Dreams
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jtsllc1
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Posted: Jul/24/2014 at 12:19am |
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I just back from the dyno and the Grace Manifolds was worth about 8 HP over the 1 5/8 Hedman header for Max Horsepower...
I still have to look at the dyno pulls to see what we had across the curve... After that we started to do a little tuning we increased another 13 HP .. we did this with full exhaust.. So the little 292 comp cam was all done at 382 RWHP running full exhaust.... He did mention if I ran a clutch fan it would be worth 10 to 15 HP ( we did not run a fan on the stand 15 years ago)..... So lets say 397 RWH maybe...So in order for the motor to make 464 at the engine the drive train would have a 16 percent loss.... I'am sure 12,000 miles did not help... Runs 375 RWHP at 35 deg. so that is what I will run on the street... Conclusion the 1 5/8 can run allot more HP that also goes for the Hedman Header .... The Hedman just has fit and form issues.... Needs work before install.... But well worth the money... I would have to say the Grace Manifolds would benefit more as the HP level of the motor build increases.. I can conclude the tight 90 deg. Manifold does not decrease HP and definitely takes care of the fit form and function issues... Thanks for following the journey of the Grace Manifolds now I will be returning to my day job and I'am looking forward to it... |
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JTSLLC1
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sweatlock
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Posted: Jul/24/2014 at 8:41am |
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So is this just an intellectual exercise or for purely personal use, or is this R & D for a product that will eventually be offered to the general public for purchase? Out of curiosity, I did a Google search for "Grace Manifolds" and nothing comes up for a company or corporation...
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jtsllc1 wrote: