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Author Topic:   Carb Jetting
65_289
Gearhead

Posts: 396
From:
Registered: Jul 2001

posted 09-15-2001 05:29 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
My birthday came early. I got a 650 double pumper. Bye-Bye Edelbrock. I think the stock jetting is 67/73. What does everbody run as far as jetting? I won't be able to put it on for about a week, and I was just curious. Also, how many of you have to make some more adjustments, like pump cam, squirters, etc?

P.S. I know every engine is different, so I know that just because you had to adjust doesn't mean I will, and vice-versa.

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Pertronix Ignitor & Flamethrower coil, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

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chips67
Gearhead

Posts: 537
From: louisville, ky, usa
Registered: Jul 2001

posted 09-15-2001 07:16 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
hey, i just finished jetting my 650dp and its not hard but you need to take the car to the track to tune it. assuming you have everything else right on the carb, jet for the best mph on your timeslip. be sure that you keep EVERYTHING ELSE constant. be sure the timing is right FIRST. run the same grade of fuel as always to find this. you are conducting a scientific experiment, so you must not touch anything else when jetting. launch the same, shift the same...every time. watch your mph, forget reading the plugs. my 650 came with 67/73's originally, and right now i run 69/75's. this was after several nights of test and tune. ALWAYS KEEP the jets a 6 size spread, front to back. you dont have a race car, dont plug the pv and jet the carb square. start by jetting up 2 sizes (always go 2 sizes at a time) if mph goes up, keep going richer. if it falls, go back from original 2 sizes. keep going whichever direstion seems to work until the mph drops off. then go back to the last setting. very easy. i can help you with other things, but you only asked about jets here. congrats, enjoy the holley.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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chips67
Gearhead

Posts: 537
From: louisville, ky, usa
Registered: Jul 2001

posted 09-15-2001 09:16 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
last issue of car craft has a very good comprehensive summary on tunning your carb. the same adjustments on demon can be done with your holley. go buy it.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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65_289
Gearhead

Posts: 396
From:
Registered: Jul 2001

posted 09-16-2001 12:16 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
last issue of car craft has a very good comprehensive summary on tunning your carb. the same adjustments on demon can be done with your holley. go buy it.


Was that the issue with the article on how to select a carb?

Also, how can I tell about whether or not to adjust the pump cam and squiter sizes?


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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Pertronix Ignitor & Flamethrower coil, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

IP: Logged

chips67
Gearhead

Posts: 537
From: louisville, ky, usa
Registered: Jul 2001

posted 09-16-2001 12:22 AM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
no, its oct. 2001 issue. check it out.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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