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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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rhodyguy
post Jan 18 2005, 12:38 PM
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Chimp Sanctuary NW. Check it out.
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when jake was doing forthcomings for trends, shortening a set of cb talls was written up. fat did the modification. jan 2003 issue.

kevin
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ChrisFoley
post Jan 18 2005, 05:43 PM
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QUOTE (agrump @ Jan 18 2005, 12:01 PM)
Racer Chris, how much would you charge to chop and weld a set of manifolds? Would it be more trouble to take out another ΒΌ 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.

I think it's about a 2 hour job including remachining the flange surfaces which won't be flat after welding inside and out.
Another 1/4" might be possible but it starts to get difficult to align the bore due to the taper.
Based on the time estimate my charge would be $132 plus shipping.
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DJsRepS
post Jan 19 2005, 06:34 AM
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Build a dual ram air system into the front curve of a GT flare near the motor. That may change the sound. Connect that to my belt driven motorcycle blower on top the machined runner block concept and then you will have even more noise but no one will hear it too long you be gone. I know the MPS would not like it. Jake I have seen the plumbing nightmares with the turbo's but I have not seen any blower's. A blower would be childs play compaired to the turbo. There must be a reason.
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r_towle
post Jan 21 2005, 10:10 AM
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Here is what I have


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r_towle
post Jan 21 2005, 10:10 AM
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srgf


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r_towle
post Jan 21 2005, 10:11 AM
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gfjnhxg


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groot
post Jan 21 2005, 10:18 AM
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If you're taking orders, I'd like to purchase the set on the upper right side (the ones with the adapters (don't need the adapters, but I'll take them if you don't want them).

Thanks, Rich. You've got quite a collection.
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groot
post Jan 21 2005, 10:23 AM
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Or the ones on the bottom left.....

Are they 40mm openings on the carb mounting or 48mm openings?
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r_towle
post Jan 21 2005, 11:33 AM
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r_towle
post Jan 21 2005, 11:34 AM
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The adapters seem to ensure that the bolt holes line up with the carbs. I would say bottom left are correct, top right are not quite right...not sure why.
Look in the classifieds.
Rich
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agrump
post Jan 21 2005, 12:17 PM
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That is a nice collection. What I have now looks to be a standard Scat manifold measures about 6" from the bottom to the top when mounted. It is hard to tell how tall the maniflds are from the pictures bit I need a manifold that is at least an inch shorter then what I have. Also I have three bolt heads but I imagine converting one would just require drilling a hole.
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groot
post Jan 21 2005, 12:29 PM
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I'm guessing that the top right set is for Solex carbs, but has an adapter for Webers.

I can machine/weld them up to make them work, but it's easier to start with the bottom left set. I responded to your classified. Thanks, again!!!!
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maf914
post Jan 21 2005, 02:42 PM
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QUOTE (r_towle @ Jan 21 2005, 09:34 AM)
The adapters seem to ensure that the bolt holes line up with the carbs. I would say bottom left are correct, top right are not quite right...not sure why.
Look in the classifieds.
Rich

I thought the adapters were there to allow a switch from Solex bolt pattern carbs to Weber/Dellorto pattern? I recall seeing those on Weber kits for early 356 Porsches. I thought one used the original Solex manifolds and added the adapters.
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ChrisFoley
post Jan 21 2005, 05:54 PM
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Rich,
Imagine a line (with a curve) running through the exact center of the runner on each of those manifolds from the surface of the top flange to the surface of the bottom flange.
What are the lengths of the manifolds measured that way?
The runner length of the original supervee manifolds that the E and F prod rules are based on is approximately 4", which appears to be significantly shorter than all those pictured.
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carambola
post Jan 21 2005, 06:20 PM
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ok, super dumb question here, but how is an efficent defined. more oversquare, more overbore or is it all in the headwork?
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r_towle
post Jan 21 2005, 06:41 PM
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QUOTE (Racer Chris @ Jan 21 2005, 03:54 PM)
Rich,
Imagine a line (with a curve) running through the exact center of the runner on each of those manifolds from the surface of the top flange to the surface of the bottom flange.
What are the lengths of the manifolds measured that way?
The runner length of the original supervee manifolds that the E and F prod rules are based on is approximately 4", which appears to be significantly shorter than all those pictured.

I will check tommorow

Are you telling me that the SCCA has made a ruling on manifolds that arent even available for purchase??? Only to be custom made?? If so, that is just plain stupid.

Rich
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davep
post Jan 26 2005, 03:56 PM
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What are these manifolds? 48mm carb dia and 33mm intake dia. about 4.6" compared to about 5.5" in the previous photos.


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davep
post Jan 26 2005, 03:57 PM
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used with Solex 40PII I seem to remember


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agrump
post Feb 9 2005, 07:59 AM
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I'm not sure anyone will care but I did find a set of shorter manifolds and did install a pair of 356 knecht air cleaners. The amount of noise at idle did not change but at WOT there is a world of difference. Instead of the "look at me, I'm accelerating" drone coming from the carbs all I hear is the exhaust. To me this sound is far more sporting as it tends to increase in volume as RPM's go up instead of just droning all through the RPM range. Also the cabin noise is not nearly as loud with the top off as it was. Don't get me wrong, it's still noisy but most of the noise is coming from the back instead of the top of the engine.

If anyone is interested in doing this mod, here is what you will need. Buy a pair of air cleaners from EBay, search for "KNECHT PORSCHE". The air cleaners came on 356's and older 912's. They are the fully enclosed ones with snorkels. You will need to mod the base plates by drilling new mounting holes and center holes for the idf/dell vents. The ventura holes are in the right spot. The base plates have tiny velocity stacks on them. I cut these off to mount standard stacks. I believe the carb openings are around 40mm so I had to add a small spacer to keep the passageway smooth bacause I'm running 36mm dells. I welding a couple pieces of 1" angle iron to the base plates which I used to mount a crossbar linkage from them.

Oh I almost forgot, the manifolds I used are standard bugpack type iv's. They are about 1" shorter then my old ones. My old ones are the ones that have drilled webbing in between the ports. Air filer elements are hard to find but the NAPA 2299 will work but they are about 1/4 too high.
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spunone
post Feb 9 2005, 09:49 AM
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