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Fine tuning? Carb and timing
Posted by: F4UCorsair45 ()
Date: June 28, 2020 09:56AM

First of all, I live in Genola Utah which is about 4500 feet in elevation. My question is what sort of jetting should I do to my 140. I want to make a little bit more power with it but mostly just want it tuned for altitude, does anyone have any good suggestions on sizes of the jets.

I’ve also been wondering about the ignition timing, recently I removed the engine and repainted all the shrouds (no rebuild) but while I was at it I put a FAST electronic ignition from Clark’s on the car. But I digress, does anyone know how many degrees of timing is best on a stock 140 to A:run and B:maybe make a little bit more power.

Any and all information is greatly appreciated, thank you

McLayne B,
Genola Utah 84655
1965 Corvair 140, 4 speed, 3.27 final drive with posi.
High school project car/daily driver

All tips and help are greatly appreciated

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Re: Fine tuning? Carb and timing
Posted by: MattNall ()
Date: June 28, 2020 11:00AM

Welcome to the CCF! Steve C Goodman /Rear Engine Specialist is our "High Alt." guru!I've lived at 4500..Add 2 degrees to your inial setting. Make sure VA's hose is plugged and HOTidle rpm is below 700 rpm.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Fine tuning? Carb and timing
Posted by: F4UCorsair45 ()
Date: June 28, 2020 12:19PM

What is the initial timing degree for a 140hp motor and does Steve Goodman do carb work/modification. If so what sort of price would it be to get them modified to run better (jet relocation and stuff like that)

Thank you!

McLayne B,
Genola Utah 84655
1965 Corvair 140, 4 speed, 3.27 final drive with posi.
High school project car/daily driver

All tips and help are greatly appreciated

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Re: Fine tuning? Carb and timing
Posted by: American Mel ()
Date: June 28, 2020 12:31PM

You need to contact Steve about his prices, and what he would reccomend.
A GREAT guy, and EXTREMELY helpful.
Hope this chart helps you.

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, 80hp, PG
'62 Monza Wagon, 4spd.
'63 Spyder,
'65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dually, approaching 400K
'03 Honda Del Sol
17'Terry

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Re: Fine tuning? Carb and timing
Posted by: steve c goodman ()
Date: June 28, 2020 01:12PM

Relocating jets is unnecessary expense unless you have sticky tires/suspension mods and are doing autox or very strenuous canyon carving.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry



Edited 1 time(s). Last edit at 06/28/2020 01:13PM by steve c goodman.

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Re: Fine tuning? Carb and timing
Posted by: F4UCorsair45 ()
Date: June 28, 2020 01:18PM

Thank you for the information, is there any other modifications to a 4X1 setup that you would suggest to maybe have a little more power gain?

McLayne B,
Genola Utah 84655
1965 Corvair 140, 4 speed, 3.27 final drive with posi.
High school project car/daily driver

All tips and help are greatly appreciated

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Re: Fine tuning? Carb and timing
Posted by: dryenko ()
Date: June 28, 2020 04:36PM

Yes, but it means engine work.
At your altitude you could easily bump up the compression by milling the step out of the heads.
And a little more flow with a 280 Isky cam shaft.
The jets in your current carbs are probably too rich for a stock engine at that altitude.
You could go down to #48 in the primaries and secondaries,
Even with ethanol in your fuel.

Bob C aka Dryenko
Dobson, NC 27017

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