I have seen that intake, very sexy.Walter R. Malik wrote: ↑Thu Mar 29, 2018 7:26 pmThere used to be an aftermarket big port cross-ram type intake available for the Chevy Corvette "Cross Fire" engines from a place called "Eddie Motorsports". RENEGADE, I think they called it.Walter R. Malik wrote: ↑Thu Mar 29, 2018 7:12 pmPersonally, I don't think any of the readily available tunnel ram manifolds have long enough runners for 6,500 RPM and below.
Some, you can extend the runners under the plenum with fabricated spacers but, that will be TALL so. how high do you have clearance before it gets to high...?
See if you can locate an old Offenhauser "DUAL-ram", cross ram type intake; they worked really well on the street in the the earlier days.
That manifold had large runners, (standard Chevrolet Corvette aluminum heads; not the extra large aftermarket runners), and an increased plenum volume. It was made for 2 single barrel throttle bodies but, I am sure the top could be machined to accept larger 4 barrel type.
EDIT: I just looked it up and JEG'S still has them available for $585.00; SUMMIT for $550.00.
Re: Ported Dart 215's with port energy discussion 3.0
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Re: Ported Dart 215's with port energy discussion 3.0
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Re: Ported Dart 215's with port energy discussion 3.0
Not much has been discussed about the shape and progression of airspeed through a 23 degree pinch. At this point I like a wide pinch with as smooth a arc as I can get. Input welcome. Thanks, Charlie
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Re: Ported Dart 215's with port energy discussion 3.0
Compared to a well known head, like an AFR of same size.
Randy
Re: Ported Dart 215's with port energy discussion 3.0
Dyno is planned for this mill when finished. Are you saying I need to purchase AFR 235's and run these head to head Randy?
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Re: Ported Dart 215's with port energy discussion 3.0
You need to use something relevent as a control set!
Re: Ported Dart 215's with port energy discussion 3.0
Charlie keep up the good work enjoy the threads and all your pics. Not many are willing to put their stuff up for critique like you do
Re: Ported Dart 215's with port energy discussion 3.0
My memory is crap, but didn't an ST'er have an efi T'ram in his truck? Charlie could also look for an SY1 "SmokeyRam". They pop up occasionally, although the nostalgia garage-wall art guys love em. Guys who try to run them on street cars seem to hate them though LOL.
Re: Ported Dart 215's with port energy discussion 3.0
You are correct and he pulls heavy loads with it at 75 mph, locked up in OD.autogear wrote: ↑Fri Mar 30, 2018 10:33 am My memory is crap, but didn't an ST'er have an efi T'ram in his truck? Charlie could also look for an SY1 "SmokeyRam". They pop up occasionally, although the nostalgia garage-wall art guys love em. Guys who try to run them on street cars seem to hate them though LOL.
https://www.speed-talk.com/forum/viewtopic.php?f=1&t=43195
Re: Ported Dart 215's with port energy discussion 3.0
Bob from Throttle built a nice tunnel ram for a truck a while ago. Cross rams suck at low rpm due to giant plenum and fuel distribution issues coupled with poor signal to 8 boosters. I think the tbi would clean up some of those issues.autogear wrote: ↑Fri Mar 30, 2018 10:33 am My memory is crap, but didn't an ST'er have an efi T'ram in his truck? Charlie could also look for an SY1 "SmokeyRam". They pop up occasionally, although the nostalgia garage-wall art guys love em. Guys who try to run them on street cars seem to hate them though LOL.
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Re: Ported Dart 215's with port energy discussion 3.0
If you say so ...
I have experienced several and they do present some sag at transition throttle openings with large carbs.
TBI does not rely upon booster signal strength and that would probably make a big difference.
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Re: Ported Dart 215's with port energy discussion 3.0
I am sure a sharp carb guy can take care of any low rpm issues. I am not a sharp carb guy. Thanks, CharlieWalter R. Malik wrote: ↑Fri Mar 30, 2018 12:36 pmIf you say so ...
I have experienced several and they do present some sag at transition throttle openings with large carbs.
TBI does not rely upon booster signal strength and that would probably make a big difference.
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Re: Ported Dart 215's with port energy discussion 3.0
I follow the push rod bulges shape in the divider and make it as thin as I dare opposite the bulge.
I agree on the smooth arc around the push rod.
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Re: Ported Dart 215's with port energy discussion 3.0
I must have misread ... I was under the impression this was going to be dual TBI throttle bodies; not carbs.Carnut1 wrote: ↑Fri Mar 30, 2018 12:40 pmI am sure a sharp carb guy can take care of any low rpm issues. I am not a sharp carb guy. Thanks, CharlieWalter R. Malik wrote: ↑Fri Mar 30, 2018 12:36 pmIf you say so ...
I have experienced several and they do present some sag at transition throttle openings with large carbs.
TBI does not rely upon booster signal strength and that would probably make a big difference.
Oh well.
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Re: Ported Dart 215's with port energy discussion 3.0
I will run dual throttle body tbi. The discussion wandered to poor low speed performance of the cross ram. Thanks, CharlieWalter R. Malik wrote: ↑Fri Mar 30, 2018 7:10 pmI must have misread ... I was under the impression this was going to be dual TBI throttle bodies; not carbs.Carnut1 wrote: ↑Fri Mar 30, 2018 12:40 pmI am sure a sharp carb guy can take care of any low rpm issues. I am not a sharp carb guy. Thanks, CharlieWalter R. Malik wrote: ↑Fri Mar 30, 2018 12:36 pm
If you say so ...
I have experienced several and they do present some sag at transition throttle openings with large carbs.
TBI does not rely upon booster signal strength and that would probably make a big difference.
Oh well.
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Re: Ported Dart 215's with port energy discussion 3.0
AND, the low speed performance penalty surely is not from past experiences unless there is caburetor(s) relying on a vacuum signal being involved.Carnut1 wrote: ↑Fri Mar 30, 2018 8:08 pmI will run dual throttle body tbi. The discussion wandered to poor low speed performance of the cross ram. Thanks, CharlieWalter R. Malik wrote: ↑Fri Mar 30, 2018 7:10 pmI must have misread ... I was under the impression this was going to be dual TBI throttle bodies; not carbs.
Oh well.
A TBI system does not share the same issues.
I guess I didn't misread and now understand you are totally against running any cross-ram manifolds for whatever reasons you may have, whether legitimate or not.
Sorry I even brought them up as any kind of alternative for what you intend to do ... I will be interested in reading about your finished product.
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