Head/cam change and jetting
2l pinto, running gp1 44IDFS. Its been set up on the rolling road with standard head and FR31 cam.
Im fitting a Vulcan ultimax big valve head and FR32 cam. Is the jetting going to need tweaking ? (In my head its sucking in the same mixture just more of it so no ) . Thanks
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Re: Head/cam change and jetting
I'd gess it wants setting up on a dyno again, if you leave them as befor you will ha e the same power ish but proberbly run lean as its flowing more air with the same amount of fuel,
Someone like graham will be along soon , he will know tho
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Re: Head/cam change and jetting
Yes the jetting will need changing.
What chokes (venturi's) are you using, 34mm or 36mm?
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Re: Head/cam change and jetting
Thanks Ill have a look tomorrow and put jet settings up also
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Re: Head/cam change and jetting
post RR jet settings on FR31 cam
carb: 44 IDF 40/41 (escort 2000 RS)
choke size: 34
Auxilary venturi: 4.50
main jet: 1.35
idle jet: 0.55
air idle jet/hole: 1.30
Emulsion tube: F11
air corrector jet: 1.80
starter jet: 0.90 F55
accelerator pump jet: 0.40
accelerator pump back bleed: 0.80
needle valve: 1.75
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Re: Head/cam change and jetting
Replace main jet with a 145 item and leave the rest as it is.
Maybe you can get away with a 140 main jet and a 57 idle jet but it could go a bit lean on top end.
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Re: Head/cam change and jetting
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