Siamesing the Intake; more work than anticipated

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May 26, 2002 | 03:58 AM

NoWorries

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Siamesing the Intake; more work than anticipated

I've got five hours into the project so far. Three hours removing the Intake, and the next two working it over. I've got two(of four) of the intake manifold ports finished, about 30 minutes apiece. I went nuts porting the plenum, thats another 45 minutes. And the last few minutes were spent on one of the runners, which was the most nerve racking because I want to go as big as possible without going too far.

Its really shaping up though, I can't wait to get this back on the car. BTW, on the right front water port, the gasket bottom was completely gone, theres my coolant leak. :smash:

May 26, 2002 | 04:30 AM

65Z01

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Re: Siamesing the Intake; more work than anticipated (NoWorries)

I thought you had already siamesed the base to a depth of 3". Did you take it in deeper?

May 26, 2002 | 04:36 AM

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Re: Siamesing the Intake; more work than anticipated (65Z01)

This is the first I've touched the intake manifold besides a polishing when I rebuilt the motor. I'm only in an inch right now, I don't have the provisions to go deeper. Have you done yours yet? If so, which tools did you use? My di-grinder is really limiting the depth.

May 26, 2002 | 05:18 AM

nsimmons

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Re: Siamesing the Intake; more work than anticipated (NoWorries)

good luck, im working out possible ways to siamese a crossfire intake. I dont need to take out as much material, but i have a smaller area to work in. As far as i know nobody has done it, but all you tpi guys have given me ideas. Right now im working on a crude flowbench to measure before and after results.

May 26, 2002 | 05:18 AM

65Z01

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Re: Siamesing the Intake; more work than anticipated (NoWorries)

I went in 1" on the current version. I don't have a grinder so used a cut-off wheel on a drill to cut two slots then used a Dremel cut-off wheel to take that piece. Then I used a straight cutter bit in the Dremel to finish up the job.

I plan to pull the base again and go in to 3". I'm sure the straight cutter bit will make it pretty easy. It cuts very fast and doesn't clog easily. Also a little oil on the work aids cutting. I have a flex extension for the Dremel which will easily reach in to a 3" depth or more.

Though she now seem to pull harder up top I believe I lost a little low torque as my short times are a little higher. If the 3" depth raises them I'll know it has cost me some low end. But I can more than get it back with heads & headers so I'm not too worried about a small low end loss. It won't likely be any worse than a Super-Ram and considerably simpler and cheaper.

Good luck with the project.

May 26, 2002 | 05:30 AM

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Re: Siamesing the Intake; more work than anticipated (65Z01)

Tomorrow at work I'm going to ask around about different ways of cutting deeper. My original plan was to go four inches, but now I'm thinking 2, 2.5, or 3 would be better. Just a cross-over, and not a new Plenum.

Your newest time is awesome. If you don't mind me asking, how much money do you have in mods to get there? These free mods are a lot of fun, its really nice seeing so much difference just because of something that we spent a little time on.

Have you done anything with the runners/plenum? Hopefully I'll have pictures tomorrow of the work I did, that is, if I can wrestle my camera away from my sister. Unfortunately I don't have a baseline or after results to measure how much of a change it made.

May 26, 2002 | 05:39 AM

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Re: Siamesing the Intake; more work than anticipated (nsimmons)

Quote:

It'd be interesting to see what you can do with the Cross-Fire. I've seen some pretty amazing setups out there, and talked with Dwyane(DesertDawg, 1982 CE) about different setups, but we haven't done anything to his yet.

Reading your sig, that reminds me, I'm deleting my EGR valve while I'm in there, its such an excessive little space taker. Its a shame that the TPI intake is so covered up, it really is a nice looking manifold. I'm also deleting the EGR input from the right exhaust, its become really ragged looking and is the eye-sore of the engine compartment.

Good luck with your project. :cheers:

May 26, 2002 | 06:20 AM

nsimmons

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Re: Siamesing the Intake; more work than anticipated (NoWorries)

right now im rigging up a mockup of a pair of runners, my plan is to cut out a few inches between each adjacent pair, my mockup will involve a sliding center wall to allowing me to take simple flow readings with different sizes. Hopefull i'll be able to find the point of diminishing returns, the main concern is fuel distibution problems at low speed, but like i said, no ones tried it and nobody knows, even on the crossfire forum, what will happen exactly.