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914World.com _ 914World Garage _ Progressive 32-36 single

Posted by: Ronnie J Nov 25 2004, 10:54 PM

Does anyone run a Progressive 32-36 single carb system. It just seems it would be a lot easier to keep tuned. I have a 1.7 without F.I. Any suggestions are appreciated.

Posted by: Mueller Nov 25 2004, 10:59 PM

terrible idea

do a search here, you'll find plenty of posts explaining why not a good choice for our type of engines....

BTW, welcome

Posted by: ChrisReale Nov 25 2004, 11:17 PM

You probably could find a full 1.7 D-Jet injection for pretty cheap.

Posted by: Dr Evil Nov 25 2004, 11:19 PM

Your title sounds like a personal ad.

Posted by: Jake Raby Nov 26 2004, 05:44 AM

May as well use a windex spray bottle filled with gas to atomize your fuel with one of those pigs!

Duals or nuttin!

Posted by: Spoke Nov 26 2004, 07:24 AM

I have a 1.7L with a single carb like you describe. It runs ok and is relatively simple but it has some limitations. There is a delay when opening the throttle like when coming out of a turn. I think its the long tubes that do that. I'm in the process of tracking down a FI system to replace my carb. Plus cold engine operation during cold weather really sucks but this may still be a choke adjustment for my car.

Spoke

Posted by: vsg914 Nov 26 2004, 07:26 AM

I know I'm gonna catch hell for this but, they are better than nothing. Nothing won't make your car go. Duals are obviously better, but if it's all ya got, it's all ya got. I've got a few guys who cars had them when they got them. They are not the most effecient, but they work and are relative trouble free. You can probably find a FI system (my first choice) for the price of new duals.

Flame on brothers.

Posted by: ! Nov 26 2004, 07:38 AM

Lightweight boat anchor....

Posted by: TC/914 Nov 26 2004, 08:12 AM

I ran one for years on my 914 with the 1.7 engine in it. Just ran like a top. When I worked (occasionally) at a VW repair shop that specialized in Type IV's most of the installations were on the later 2 liter engines and (I feel that) the carbs performed TERRIBLY ! ! ! The Type IV engine is different from the one on the 914, but it was more the carb than the engine. Maybe good for the smaller engine, although it NEEDS EXTENSIVE TUNING, lousy on the larger one.

Luck,

TC

There's a complete set-up on ebay right now for short money, maybe grab it and play around a little . . .

Posted by: vsg914 Nov 26 2004, 08:20 AM

TC, I'm not sure I understand your post. 1.7L in a 917?
How is a type IV different than the one in a 914?

Posted by: TC/914 Nov 26 2004, 08:45 AM

Oooopppsss!!

My bad typing at work, I just edited the post. (My brain sort of melded the "914" and "1.7" into a wishful thinking sort of mess . . . ) Wouldn't it be beyond WONDERFUL to own a 917?!?

Whenever we checked the compression on an (72 and up Bus VW type IV) engine--standard proceedure, along with fuel and oil pressure whenever a bus came in for repairs--it was lower than that of my 914 (NOT 917). I had always thought that the engine used in the bus was a little de-tuned from that found in the 914 (and 411/412 VW sedans). I had heard that the dish in the bus pistons wasn't in the Porsche pistons. Also, the progressive carbs seem to respond better to a cam which made me think that the grind in a 914 was slightly different than that in a VW Bus/type IV.

I might be wrong, if I am PLEASE let me know since I've been going on the above assumption for almost six years and if it's in error . . . well, I want to know.

Thanks,

TC

Posted by: Jake Raby Nov 26 2004, 09:30 AM

One huge issue is the super long runners and no carb heat.

The long runners create a tuning nightmare and the no heat situation will ice the carb completely on humid cold nights like we have here in the Southeast..

I have had a 914 actually stall from a frozen carb before!

Posted by: TC/914 Nov 26 2004, 09:45 AM

YES! I've always wondered about the runners. I'm surprised that the carbs work as good (or at all) as they sometimes do. The original design using the long runners was meant for air alone, wasn't it? The fuel was supplied down stream at the injectors? Considering the work that goes into match porting and smoothing/grinding the dual carb intakes for Type IV and even Type I engines, it seems sort of "don't bother, it'll work good enough" to just run with metal tubes connected to a collector box/carb mount. No pyramid or channels in the carb mount/manifold., no chimney from the exhaust header to the tubes, no pre-heat at the air cleaner from the muffler, nothing at all.
Maybe the set-up was originally used in South America (like the KADS)?

Donno . . .

TC