Semi race motor advice

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fp55scca
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Re: Semi race motor advice

Post by fp55scca » Thu Jan 31, 2019 10:46 am

SimcaBertone66 wrote:
Wed Jan 30, 2019 9:58 am
As some of you may already know, the Jet Carburetor Rochester 2G is marketed as a "spec" carb for spec V8 powered class of circle track race cars. ….
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--No question Joe. But don't confuse these two carbs......a Holley 5200 is no match for a Jet Carb Rochester 2G. The Rochester 2G has 42.8625mm bores and 34.925mm ventures! :lol:

--Also, my feeling on the compression choice is..... why build a high compression street motor that must run race fuel? Keep it under 10.1, and make up the difference with cam choice, head prep, and intake and exhaust development, and of course, carb(s).
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 CSA Abarth Replica
1981 Fiat Spider Ratrod
whitehause
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Re: Semi race motor advice

Post by whitehause » Thu Jan 31, 2019 3:22 pm

been looking into the 2 jet Rochester. They aren't crazy expensive. I might try to find a used 40 or 44 dcnfdcoedflbr2d2 or whatever the correct number is for the single carb Weber application. This foreign stuff is killing me :lol:
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SimcaBertone66
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Re: Semi race motor advice

Post by SimcaBertone66 » Thu Jan 31, 2019 4:28 pm

Jim, I stopped being "practical " about these things a long time ago …. lol..... the experience of hitting the loud pedal in a 13.1 cr TC Fiat on 110 octane is so much more a violent event .. cant get enough of dat … and the perfume of race fuel …for me .. priceless
Joe DeGasperis
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Re: Semi race motor advice

Post by fp55scca » Thu Jan 31, 2019 5:07 pm

--I hear ya Joe, and trust me, I understand. Every time I fire up the racecar, it always reminds of the Robert Duvall line in the movie, "Apocalypse Now" about loving the "smell of napalm in the morning"! I just substitute the words "Sunoco 110 octane" :D
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 CSA Abarth Replica
1981 Fiat Spider Ratrod
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SimcaBertone66
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Re: Semi race motor advice

Post by SimcaBertone66 » Thu Jan 31, 2019 5:49 pm

That made me half snort half chortle ….
Joe DeGasperis
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Re: Semi race motor advice

Post by whitehause » Thu Jan 31, 2019 6:48 pm

I'm less than 1/2 hour from Maple Grove Raceway, so I have a variety of race gas to choose from.

I'm guessing something like this is what you used Joe?
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whitehause
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Re: Semi race motor advice

Post by whitehause » Fri Feb 01, 2019 7:22 am

OK, I like Joe's set up with the 2 Jet. Got a line on a rebuilt 75 buick 2 jet that is already an A/T carb.

I'll go with the Becker racing 9.8 to 1 pistons since it seems like most true compression ends up being a little higher than advertised, plus I might have the head trued up which will add a little compression bump.

42/82 cams

Stainless free flow exhaust with cat deleted.

Starting my head work now using GC's references. It won't be the most powerful thing out there, but should be a fairly good runner for what I have in mind.
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SimcaBertone66
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Re: Semi race motor advice

Post by SimcaBertone66 » Fri Feb 01, 2019 10:23 am

Yes, that looks familiar... the manifold on my car was custom made, with respect to the adapter mating the 2G to the 1.8 intake, almost 20 years ago … and deployed in 2012 when I ditched twin IDF's (after almost 25 years of use) and sold then to Carl F....

Using the Transadapt parts and the original 2G, off my 66 Pontiac 389 Catalina I only "mocked it up " … so how it's attached it to the manifold is up to the builder. As you know the 2G pulls the throttle, north- south but with a stock type "arm" attached to the 1.8 intake manifold you can use a stock 124 spider cable.... Mind you, this was spurred by rebuilding the 389 in the Catalina and the two barrel was replaced with a 4 barrel … looking at the 2G ,,... like humm, that thing looks like it will fit Fiat manifold ….! well it does and it FN works really well ….

When you approach 10.1 cr + cams+ more carburation+ more efficient exhaust system with these motors .....that when it really start to be FUN !
Joe DeGasperis
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Re: Semi race motor advice

Post by SimcaBertone66 » Fri Feb 01, 2019 10:27 am

The other thing that made go with the Jet was the price … the 2 barrel Weber's are bloody expensive … Years ago I had a 38/38 DGAS with synchronous throttle plates … it was dam near $400 in the nineties
Joe DeGasperis
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Re: Semi race motor advice

Post by whitehause » Fri Feb 01, 2019 5:06 pm

I hear ya, I can get the rebuilt 2 Jet that was pressure tested,and with a 90 day warranty for $100 shipped. And it's the Auto trans version so it has the area on the throttle arm for the kick down cable. Now that I can do.....$1200 for just the two IDF's and manifold is out of the program parameters right now. As far as an adapter....that why they invented grinders and Tig welders :D

Did you have any hood clearance issues with the air cleaner on it?
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