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Warren Hall Student
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PMO/Weber jetting advise needed
Hi Guys,
I have a new engine build and could use some help on jetting to get me in the ball park. Unfortunately Richard Parr sold PMO to Empi and they are no help. Once I'm in the ball park I can take it from there with my LM-2 and my seat of the pants dyno. The engine came to me as a 3.0L with PMO 46's and I rebuilt it to 3.5L Using a new set of Mahle Max Moritz style pistons and cylinders and a 964 crank. Original plan was to build a 3.2L with Mod S cam but that changed mid build to the current configuration which will have less peak HP but a lot more low end torque. 3.5L Specs: SC cam (stock) Intake 38mm Exhaust 35mm 35mm headers PMO 46mm Current PMO setup: Venturi 36mm Idle Jet 55 Main Jet 135 Emulsion tube F7 Air correct. 175 Using Paul Abbotts (Performance Orientated) formulas and his Venturi selection chart I came up with the Venturi selection of 42mm. Now I need a general starting point for the jetting. New Setup: Venturi 42mm Idle Jet ? Main Jet ? Emulsion tube F7 Air correct. ? Anybody got any ideas what would be a good starting point for my jets and air correction? Thanks in advance,
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ Last edited by Bobboloo; 06-30-2023 at 11:21 AM.. |
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06-29-2023, 03:37 PM
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Registered
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On my 2.8 with 46 PMOs
Venturis- 38 Mains- 160 Main airs- 175 Idle- 60 Idle air-110 Emulsion tubes-F16 My heads are Ported 40 intake/ 35 exh. Running RSR headers with 997 GT3 Muffler Mod S cams Hope this helps. Richard helped me out to get it dialed in. |
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06-29-2023, 03:55 PM
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Warren Hall Student
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Thanks for the data points.
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ |
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06-29-2023, 04:21 PM
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Warren Hall Student
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Everybody likes pics so here's a couple.
 
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ |
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06-29-2023, 04:29 PM
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Registered
Join Date: Aug 2018
Location: Maryland
Posts: 2,264
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3.2 with a very aggressive cam, dyno'd 274 whp
46MM PMO Vents - 38 was 40 Mains - 175 Idles - 60 Tubes - F16 Idle Air - 130 Air Corrector - 180
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83' Coupe - Ex-RaceCar 77' Targa Narrow Body - SC powered Copper Brown Metallic |
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06-30-2023, 03:25 PM
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Warren Hall Student
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Thanks for the additional info. I ended up talking to Richard Paar yesterday. Turns out a friend of mine has been working for him lately. I'll post his suggestions here incase anyone else has a similar engine build. I'll post back as well once I get a graph of the AFR's from my LM-2.
His suggested starting point. Idle jet 55 Main jet 155 Air correction 185 (not available so 190) Idle air 130 Venturis 38mm
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Bobby _____In memoriam_____ Warren Hall 1950 - 2008 _____"Early_S_Man"_____ |
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07-06-2023, 06:36 AM
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Registered
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Any progress?
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Kermit, 73 RS clone, Just Part of the Team Chris Leydon ,Louis Baldwin ,Peter Brock ,Riche Clark Jerry Sherman ,Rob McGlade ,Donnie Deal Hank Clarkson ,Craig Waldner ,Don Kean ,Leroy Axel Gains |
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12-19-2023, 02:35 AM
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Registered
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Any progress?
Ian
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Kermit, 73 RS clone, Just Part of the Team Chris Leydon ,Louis Baldwin ,Peter Brock ,Riche Clark Jerry Sherman ,Rob McGlade ,Donnie Deal Hank Clarkson ,Craig Waldner ,Don Kean ,Leroy Axel Gains |
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12-19-2023, 02:36 AM
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73' Porsche Targa
