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michaelmount123 wrote: Sun May 26, 2024 3:40 pm
I'm quite sure a 944 intake manifold could be made in 4 pieces with only minor changes to the cylinder head flange bolt pattern. Here is one I had machined for a 4V using the ATPower throttle bodies. It resulted in a GORGEOUS piece of kit, but was pretty pricey. Unfortunately the engineering company wouldn't give up the CAD files.
If you had a sample part I could use as a template, I could most likely do a CAD replicate in all my spare time -- might take a while, but I'm like the tortoise who just keeps plugging away against all odds.
I've also wondered about this. I've seen bits of intakes 3D printed and even a complete one but these have been made only for fitting purposes before finishing the product as a metal part.
Looking at my CNC'd intake, it's clearly been built in parts to be constructed as a whole. Could you smart people not make something similar and even if the material is strong but perhaps hydroscopic, you could dip, coat or line the internals to deal with any chemicals?
michaelmount123 wrote: Sun May 26, 2024 3:40 pm
I'm quite sure a 944 intake manifold could be made in 4 pieces with only minor changes to the cylinder head flange bolt pattern. Here is one I had machined for a 4V using the ATPower throttle bodies. It resulted in a GORGEOUS piece of kit, but was pretty pricey. Unfortunately the engineering company wouldn't give up the CAD files.
Do you have the full sized version of those drawings?
The only intake manifold drawing I have is the one I posted - 8.5x11.
I'm curious about current pricing on the AT throttle bodies. I'll contact them and ask about duplicating the set in the drawings. Their stuff is gorgeous (worth saying again); all properly designed and properly executed. They make Jenvey TB's and linkage look like grade school stuff. Go with AT throttles if you can.
michaelmount123 wrote: Thu May 30, 2024 5:07 pm
The only intake manifold drawing I have is the one I posted - 8.5x11.
I'm curious about current pricing on the AT throttle bodies. I'll contact them and ask about duplicating the set in the drawings. Their stuff is gorgeous (worth saying again); all properly designed and properly executed. They make Jenvey TB's and linkage look like grade school stuff. Go with AT throttles if you can.
adonay wrote: Tue May 28, 2024 12:44 pm
Poly carbonate is good stuff anything mixed with PETG i am not so sure about . PC is a nightmare to print as it is so hygroscopic even when using a drying cabinet maybe i should buy a better one .
I printed a small test cylinder/cup out of a PC blend I have. It advertises a heat resistance of 100c. My printer is enclosed but not insulated much so I can't hit low 60c in temp max after a long time pre heating. I printed this at ~50c interior temp at 110c on the plate (theres a roughly 10 degree drop between the sensor and the top of the plate) and 275 on the hotend.
It was .75" diameter with .1" wall thickness and 1 inch overall height. Pretest measurement the diameter was .745 mean. walls .0985 and overall height was .998.
The little size was right to basically sit over one of the intake flange bolts and I used a vacuum line over it to kinda hold it in place. Then drove around for the last 2 days. I also left the car out in the direct sun (nice black hood heats things up good).
Its been through about 5 active (driving) full heat cycles (ambient to operating temp). 1 of those was just me holding the RPMs to around 3K sitting idle so the temp reading on the gauge was a little higher than normal.
When I got home after the last drive I popped the hood immediately and grabbed the cylinder and tried to deform it by squeezing. Anywhere near the transition temp would have deformed the cylinder.
Remeasuring I saw no statistically significant changes to dimensions. Same mean same std dev. etc.
I wasn't driving like a race car but I was bringing the rev range upto close to 6k on the more spirited drives. Seems like a viable material. Its only $25 on amazon: https://www.amazon.com/dp/B075SXS6NP
michaelmount123 wrote: Wed Jun 05, 2024 5:53 pm
I've reached out to AT about current pricing for their throttles set up for my intake manifold. Hopefully there's news soon.
I did dig up original copies of the throttle drawings which may scan better. The dimensions are in red, which doesn't can well. Anyone interested?
