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Will this work for a mild 302?
First time with Webers. Looking for advice and perhaps some inspiration.
Here's what I have: IDF 48 (96 vintage) 37 Venturi / Aux Venturi 4.5 60 idle jet F5 E tube 155 main jet /195 air corrector 50 pump jet / 40 pump exhaust 200 needle valve Camshaft - Hyd roller 222 intake / 232 exhaust (@.050) .510 intake / .532 exhaust lift (1.6 rocker) 112 lobe separation 9.8 compression 58cc aluminum heads / 1.94 int / 1.60 exh What should I expect on the initial fire up? Any suggestion on jetting or E tubes is hugely appreciated. Thanks, 289FIA |
I'd say if you have a well designed linkage that has all the carbs moving exactly together, then your initial setup should be close enough for a startup, carb synchronization, mixture adjustment, idle speed etc.
FYI, I ran a set of 44 IDFs with a 38 venturi on a 308. |
I'd go smaller on the main jet & leave the air corrector. Really, save some money & , leave that circuit stock. If you are going the "tune yourself" route, as I did. Jetting by replacing parts is going to break the bank. The way to go is to close them up with solder & re drill them. When you get it where you like it, buy the proper sized jets & come out money ahead.
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Thanks Gaz64. I needed the reassurance that this combo could actually run!
*13* Good advice on solder & re-drilling. Makes sense! I’m sending the exhaust primaries out to have O2 bungs welded in. Hoping the use of an Air/Fuel Ratio meter will reduce the "trial & error" time! |
289FIA,
Have you read the article on Weber Tuning by Tennessee Tim? If not, I would highly recommend that you do so before you start on your Webers. Tuning Webers Cheers, John |
Another article, although on DCOE, applicable to IDF, since they function the same. DCOE sidedraught, IDF downdraught.
http://www.classicrallyclub.com.au/d..._DVAndrews.pdf |
jhirasak
I’ve read Tennessee Tim’s article several times. Though it’s dedicated to IDAs, the theory is pertinant for IDFs. Gaz64 Thanks for the link. All information is very useful. I like the formulas! Valve cover interference with the accelerator pump rod is preventing my first start up. :o |
I've seen your thread about show your valve covers, and you've probably seen the thread link for another guy with the same issue.
The trouble is the early IDFs had a different pump actuating lever, roller follower like IDA, and would have had no clearance issues. The linkage became like Dellorto DHLA at some point, probably when they became non-Italian. The manifold was probably designed for early carbs. A bit of a problem to come up with a good remedy. A brazed in welch plug might work if you have rocker clearance. You would have to cut the lid off a rocker cover for experimentation. |
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Think you nailed it. Looks like it's time to get creative. If only I had welding skills... :( |
you are better off with the IDA's. The IDF's are not period correct if that matters to you. And they have a dismal resale value in comparison to the IDA's.
They, the IDF's, do have a choke, but I have not felt my car needed one to start, even on days below freezing. your cam would work better with a wider LSA. 112 is not optimal. 114 is barely acceptable, with a 115 or 116 being the better fit with Webers. Z. |
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I can get a photo if it will help. |
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