The Ford Barn

3twinridges · 03-28-2021, 11:23 AM

The Holley 94 8RT truck carb I just took apart had 52 jets in it. I have read on here that 51 jets are recommending and that is what I have in it now. Would I see a performance increase with 52 jets? It’s an 8BA bored 60 over with a 4” stroke.

JB

JSeery · 03-28-2021, 02:06 PM

You are looking for the best A/F ratio for the application. An A/F meter helps a lot. The idea jetting can vary based on all kind of factors.

tubman · 03-28-2021, 04:28 PM

I added an A/F meter to my test stand and found it quite valuable.

I have yet to put one on a car, and may never do so.

flatjack9 · 03-28-2021, 08:29 PM

What altitude are you at?

3twinridges · 03-28-2021, 08:31 PM

North Atlanta, 1,400 ft

Ol' Ron · 03-29-2021, 08:04 AM

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Not being able to see the AF, when the engine is under load defeats the purpose of the instrument, ALL street engines should be tuned under cruise conditions, as the engine spends 90% there. A rich mixture is only beneficial under WOT. Also the ignition timing must be retarded some what. Aproperly tuned will last longer and be more fuel efficient.
Gramps

scicala · 03-29-2021, 10:33 AM

The 94 type carbs came with some different sized jets over the years from '39 to '56.
Some had 52 jets. I would just leave it alone and see how it runs.

Sal

flatjack9 · 03-29-2021, 11:06 AM

I would choose 51 jets, but you shouldn't have a problem with 52's.

03-28-2021, 11:23 AM	#1
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Holley 94 jets The Holley 94 8RT truck carb I just took apart had 52 jets in it. I have read on here that 51 jets are recommending and that is what I have in it now. Would I see a performance increase with 52 jets? It’s an 8BA bored 60 over with a 4” stroke. JB

03-28-2021, 02:06 PM	#2
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: Holley 94 jets You are looking for the best A/F ratio for the application. An A/F meter helps a lot. The idea jetting can vary based on all kind of factors.

03-28-2021, 04:28 PM	#3
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,303	Re: Holley 94 jets I added an A/F meter to my test stand and found it quite valuable. I have yet to put one on a car, and may never do so.

03-28-2021, 08:29 PM	#4
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,525	Re: Holley 94 jets What altitude are you at?

03-28-2021, 08:31 PM	#5
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Re: Holley 94 jets North Atlanta, 1,400 ft

03-29-2021, 08:04 AM	#6
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,855	Re: Holley 94 jets Sponsored Links (Register now to hide all advertisements) Not being able to see the AF, when the engine is under load defeats the purpose of the instrument, ALL street engines should be tuned under cruise conditions, as the engine spends 90% there. A rich mixture is only beneficial under WOT. Also the ignition timing must be retarded some what. Aproperly tuned will last longer and be more fuel efficient. Gramps

03-29-2021, 10:33 AM	#7
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,698	Re: Holley 94 jets The 94 type carbs came with some different sized jets over the years from '39 to '56. Some had 52 jets. I would just leave it alone and see how it runs. Sal

03-29-2021, 11:06 AM	#8
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,525	Re: Holley 94 jets I would choose 51 jets, but you shouldn't have a problem with 52's.

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