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> I need short manifolds for a pair of IDF's
agrump
post Jan 17 2005, 07:43 PM
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Anyone know where I can get them?

Thanks
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URY914
post Jan 17 2005, 08:34 PM
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Can you cut the top (carb) flange off, cut a section out and weld the flange back on??
Just wondering? I've heard the short ones are hard to find and I need some too.

Paul
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Aaron Cox
post Jan 17 2005, 08:43 PM
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whats great about the short ones?

taller = more torque right?
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r_towle
post Jan 17 2005, 08:45 PM
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I have a few, what do you mean by short??

Rich
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scooter311
post Jan 17 2005, 08:59 PM
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Heya I just got rid of a set of shortys - I hated them, it was a nighmare trying to change plugs, wires, etc. I traded a dood for a tall set a short while ago. I would've paid you to take them, I hated them so much (IMG:http://www.914world.com/bbs2/html/emoticons/ar15.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/ar15.gif)
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URY914
post Jan 17 2005, 09:26 PM
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QUOTE (Aaron Cox @ Jan 17 2005, 06:43 PM)
whats great about the short ones?

taller = more torque right?

Well, Jake told me to get short ones soooooo, I'm looking for short ones
'neff said. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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cha914
post Jan 17 2005, 09:54 PM
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hmm...I like welding alum...just got a new bandsaw....sounds like fun (IMG:http://www.914world.com/bbs2/html/emoticons/tongue.gif)
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r_towle
post Jan 17 2005, 09:56 PM
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so, how short do you need them, I have a few sets here of differing lengths.

Rich
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Jake Raby
post Jan 17 2005, 10:04 PM
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Its all dependant upon the combo!

Efficient engines like a shorter manifold to produce the best results in the upper RPM range. Intake length is just part of the overall runner length, combined with the velocity stack length as well..
The stacks and the manifolds must be chosen for the engine to make its most..

Thats why I have a dyno and every manifold and stack known to man. Every new combo gets tested with all them to see which ones give the best curves.
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r_towle
post Jan 17 2005, 10:40 PM
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QUOTE (URY914 @ Jan 17 2005, 06:34 PM)
Can you cut the top (carb) flange off, cut a section out and weld the flange back on??
Just wondering? I've heard the short ones are hard to find and I need some too.

Paul

Again, in response to YOUR question...
And the previous question, how short would you like to get.

I have, on my shelf several different length setups.

I am aware that each engine has differing needs, that was not the question here...

The question is where to get the manifolds.

I have some, what size are you needin?

Rich
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ChrisFoley
post Jan 18 2005, 05:35 AM
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QUOTE (URY914 @ Jan 17 2005, 09:34 PM)
Can you cut the top (carb) flange off, cut a section out and weld the flange back on??
Just wondering? I've heard the short ones are hard to find and I need some too.

Paul

I built a fixture to do just that!
Specifically - I can shorten the standard IDF manifolds from 5 1/4" to 4 " runner length, which is the same as the standard Solex manifolds.
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DJsRepS
post Jan 18 2005, 05:59 AM
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When I grow up Im getting me a motor by Jake! with one of his side shift 4speed. No need for 1st gear of a 5 speed with his dyno proven hp and rpm.
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Walter
post Jan 18 2005, 06:06 AM
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I really don't have assets in that company, but Ahnendorp makes rather short manifolds, compared to the CB ones, both for 4-bolt and 3-bolt. Not one size fits all. And the 40IDF manifold has a 40mm opening, the 44IDF/45DLRA manifold has 45mm opening, not 48mm for all carbs as I've seen a lot.
Also, those manifolds let you mount your carb either way around (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)

Regards,
Walter
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Joe Ricard
post Jan 18 2005, 07:18 AM
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Wish I had a dyno (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif)
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agrump
post Jan 18 2005, 07:52 AM
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Oh I hope I don't get lambasted for this. I need short manifolds so that I can use a pair of air cleaners from a 356/912. The purpose of it is to cut down on intake noise. I need at least an inch more clearance, 1-1/2” would be better. My current manifolds are the standard tall ones that come with your usual carb kits. 5 ¼” sounds about right so a 4” or less manifold would work for me.

I have not considered what effect this will have on performance. My engine is not that highly tuned from what I can tell from the paperwork I got when I bought the car. It’s a 2.0L euro pistons with a .03” spacer, FAT FC442 cam and 2.0L heads. I’m guessing the compression ratio is 7.5:1.
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maf914
post Jan 18 2005, 07:53 AM
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I bought a pair of short manifolds, shorter than the typical CB Performance manifold for 2-barrel IDF's, from PMO several years ago. They may still offer these.
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ChrisFoley
post Jan 18 2005, 09:07 AM
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QUOTE (maf914 @ Jan 18 2005, 08:53 AM)
I bought a pair of short manifolds, shorter than the typical CB Performance manifold for 2-barrel IDF's, from PMO several years ago. They may still offer these.

The PMO manifolds are 5 1/4" runner length. They are available properly sized for 40 or 44 IDF carbs.


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Jake Raby
post Jan 18 2005, 09:22 AM
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The intake noise probably won't drop much with the addition of the 356 air filters.... Many times the intake note is a by- product of the camshaft choice as well as the headwork. Alot of engines that have huge intake valves have this trait and it really can't be remedied.

The FAT cam you mention is notorious for this trait. Its almost as bad as the Web 494
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agrump
post Jan 18 2005, 11:01 AM
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Ugh, that’s bad news; I was hoping that it would make a significant impact on the noise level. I don’t believe there has been any headwork besides a new set of stock valves/seats. I’ll still try it but when it doesn’t work I’ll consider splitting the block to change the cam and maybe bumping up the displacement. A cam change may be a good thing as I’m happy with the power but the mpg is lower then I would expect. I’m also planning on addressing the mpg problem by controlling timing with a megasquirt unit. I have all the pieces lying around so I might as well use them.


Racer Chris, how much would you charge to chop and weld a set of manifolds? Would it be more trouble to take out another ¼ inch? I have a spare set of Scat manifolds that look similar to the one shown except it has more webbing between the two ports.
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Walter
post Jan 18 2005, 11:54 AM
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FYI, intake noise is greatly reduced with a central intake airfilter system. Not cheap tho..

Greetings,
Walter
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