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Re: Thermoquad on RPM Air Gap [Re: mopowergtx] #832235
10/23/10 01:16 PM
10/23/10 01:16 PM
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IL, Aurora
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ademon Offline
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Quote:

Original poster. Street car right? Why not just run a stock 71-78 cast iron intake? Heck probably get one for free if you bug enough buddies for what they got laying around. Worst case scenario maybe twenty bucks.

Thats a 79 but I wish it was a 78 because of that stupid tin thermostat housing they started using and turned 45 degrees starting in 79. I missed that completely until after I sand blasted and painted it.


Not a bad idea, i dont think you would be giving up to much HP with a 71/72 intake, especially if modified and port matched but they are heavy !!!!

Re: Thermoquad on RPM Air Gap [Re: ademon] #832236
10/25/10 10:38 PM
10/25/10 10:38 PM
Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
boydsdodge Offline OP
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Thanks guys, I am building a 408 with Edelbrock heads, for use in a Challenger that I will take to the road course for some solo runs.
Trying to keep the weight down as a go as much as I can.

Re: Thermoquad on RPM Air Gap [Re: boydsdodge] #832237
10/25/10 11:24 PM
10/25/10 11:24 PM
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HYPER8oSoNic Offline
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Quote:

Thanks guys, I am building a 408 with Edelbrock heads, for use in a Challenger that I will take to the road course for some solo runs.
Trying to keep the weight down as a go as much as I can.




Then go with an aluminum intake. Good choices out there for the TQ! Good weight distribution goes A
LONG WAY for handling and tires!!



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
Re: Thermoquad on RPM Air Gap [Re: HYPER8oSoNic] #832238
10/26/10 08:18 PM
10/26/10 08:18 PM
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Toronto, Ont, Canada
boydsdodge Offline OP
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Which brings me back to my original question.

Re: Thermoquad on RPM Air Gap [Re: boydsdodge] #832239
10/28/10 05:15 AM
10/28/10 05:15 AM
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Posts: 3,943
Melbourne.....Oz-land
Moparmal Offline
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Yep, my TQ on a 318 stroker bogs all the way to 12.6 - and thats a NON reco carb, with 40 year old floats and bowl - and there's more in it.

On topic - I have hogged out both an LD4B and an LD340 successfully - an air gap should prove no issue either.

(PS - Don't listen to what some "others" on other sites have to say on this issue - they're yet to prove to be able to run a qtr time, let alone know what can and can't be done with a TQ and a 4B or LD........listrn to the Demon .)

Re: Thermoquad on RPM Air Gap [Re: Moparmal] #832240
10/28/10 07:17 AM
10/28/10 07:17 AM
Joined: Feb 2003
Posts: 607
NY
old340dog Offline
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NY
Is there a provision on the LD340 and the Air Gap for the automatic choke? Or do you use a manual choke. I've noticed this on my LD340 intake and have thought about using a TQ that I have.


old340dog
Re: Thermoquad on RPM Air Gap [Re: boydsdodge] #832241
10/28/10 08:08 PM
10/28/10 08:08 PM
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HYPER8oSoNic Offline
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Quote:

Which brings me back to my original question.




If you feel comfortable "reworking" the Air Gap
go for it! The performance loss would be minimal if the "machining process" is done right
and the bores are blended smooth! LD 340 would be a little better to do, but the Air Gap manifold is the next best thing! You're on track my friend,
take your time and do it carefully!!



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
Re: Thermoquad on RPM Air Gap [Re: HYPER8oSoNic] #832242
10/29/10 12:16 PM
10/29/10 12:16 PM
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Kalispell Mt.
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HotRodDave Offline
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I think some of you guys have never had a t-quad base plate sitting on an RPM or RPM air-gap, there just is not enough meat there to grind away, you have to weld up the flange area then mill it back flat then you can grind clearance for the blades and have a smooth transition. That is the only way it is gonna happen unless you run a thick gasket and only grind minimal clearance for the opening blade and in that case you have a big step that will hurt performance, possibly cause tuning issues and fuel seperation. You wil still be asking for vaccume leaks because there is only about 1/32 gasket clamping area if that(may vary a few thou either way depending on particular castings). I tried everything I could imagine to do it and ended up with a mr gasket adapter siliconed to the manifold and a thin gasket, an air cleaner fit just fine with a drop base in my 68 cuda, I would have guessed an e-body would have had a little more room but I really don't know about e-bodys.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Thermoquad on RPM Air Gap [Re: HotRodDave] #832243
10/29/10 01:15 PM
10/29/10 01:15 PM
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
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oberlin, Ohio
I have modified LD340 intakes for thermoquad use. They can be done nicely. It really helps to be skilled with a die grinder and it takes more time than most think. I've looked at perf RPM intakes with the intent of modifying for a thermoquad and concluded it could not be done without adding an adapter (to an already tall intake) or extensive welding.

Note: No aftermarket intakes that I have measured have as low a profile as an LD340. Going from memory, they are about 5/8-3/4 inch shorter than a perf rpm or weiand action.


1971 Factory Appearing Duster 340 11.000 @ 122 mph
Re: Thermoquad on RPM Air Gap [Re: Rapid340] #832244
10/29/10 03:58 PM
10/29/10 03:58 PM
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IL, Aurora
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ademon Offline
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I scribed out the carb gasket on the LD i have and the secondary side would only have about .060 on one side to seal, other side is better at .100, is this ok Rapid??? its awful close unless i want to leave a step.

Re: Thermoquad on RPM Air Gap [Re: ademon] #832245
10/29/10 04:14 PM
10/29/10 04:14 PM
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340 Offline
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Sounds a little thin. Look at the gasket up against the carb, if it is much bigger than the bore openings look for a different gasket. If you are using one of the phenolic spacer gaskets, they tend to be large. I would make an effort to limit the opening in the manifold to a size no larger than the carb would require if it were sitting on the manifold without a gasket.



1971 Factory Appearing Duster 340 11.000 @ 122 mph
Re: Thermoquad on RPM Air Gap [Re: Rapid340] #832246
10/29/10 08:43 PM
10/29/10 08:43 PM
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal Offline
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HOt Rod Dave - I'll put my hand up and say I've never seen it done with an RPM / Air Gap.

Looking at this pic of a 340 - there's obviously more "meat" in the back half of the flange, making it possible.



I did think the RPM was a very similar design to the LD series - so its interesting to find that the flange is significantly thinner.

Re: Thermoquad on RPM Air Gap [Re: HotRodDave] #832247
10/29/10 10:50 PM
10/29/10 10:50 PM
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Quote:

I think some of you guys have never had a t-quad base plate sitting on an RPM or RPM air-gap, there just is not enough meat there to grind away, you have to weld up the flange area then mill it back flat then you can grind clearance for the blades and have a smooth transition. That is the only way it is gonna happen unless you run a thick gasket and only grind minimal clearance for the opening blade and in that case you have a big step that will hurt performance, possibly cause tuning issues and fuel seperation. You wil still be asking for vaccume leaks because there is only about 1/32 gasket clamping area if that(may vary a few thou either way depending on particular castings). I tried everything I could imagine to do it and ended up with a mr gasket adapter siliconed to the manifold and a thin gasket, an air cleaner fit just fine with a drop base in my 68 cuda, I would have guessed an e-body would have had a little more room but I really don't know about e-bodys.




Silicone is bad for intake to carb surfaces. Could you have tried J-B Weld on it and work an adapter? Silicone is TOO messy and disrupts the flow from the carb through the intake and to the heads! Food for thought!!



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
Re: Thermoquad on RPM Air Gap [Re: HYPER8oSoNic] #832248
10/30/10 12:03 AM
10/30/10 12:03 AM
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Kalispell Mt.
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HotRodDave Offline
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Quote:

Quote:

I think some of you guys have never had a t-quad base plate sitting on an RPM or RPM air-gap, there just is not enough meat there to grind away, you have to weld up the flange area then mill it back flat then you can grind clearance for the blades and have a smooth transition. That is the only way it is gonna happen unless you run a thick gasket and only grind minimal clearance for the opening blade and in that case you have a big step that will hurt performance, possibly cause tuning issues and fuel seperation. You wil still be asking for vaccume leaks because there is only about 1/32 gasket clamping area if that(may vary a few thou either way depending on particular castings). I tried everything I could imagine to do it and ended up with a mr gasket adapter siliconed to the manifold and a thin gasket, an air cleaner fit just fine with a drop base in my 68 cuda, I would have guessed an e-body would have had a little more room but I really don't know about e-bodys.




Silicone is bad for intake to carb surfaces. Could you have tried J-B Weld on it and work an adapter? Silicone is TOO messy and disrupts the flow from the carb through the intake and to the heads! Food for thought!!






I just siliconed the spacer to the intake, then blended it in with the die grinder so no left overs hangin in the plenum.

I have done an LD4b and it has a different carb pad than an RPM, the LD4b and LD340 have basically tha same carb pad. It only took a couple minutes to rough it in. I used an 850 t-quad baseplate and a black marker to mark color everything in ther to remove, then I mounted a christmas tree carbide in a router and ran it around to remove all the black marker then hand blended the transition with a die grinder, almost looked like a cnc had done it when I was done.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Thermoquad on RPM Air Gap [Re: ademon] #832249
10/30/10 11:34 AM
10/30/10 11:34 AM
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Posts: 3,075
Eastern Ohio
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Re: Thermoquad on RPM Air Gap [Re: mopowergtx] #832250
10/30/10 08:11 PM
10/30/10 08:11 PM
Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
boydsdodge Offline OP
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?

Re: Thermoquad on RPM Air Gap [Re: mopowergtx] #832251
01/25/11 11:39 PM
01/25/11 11:39 PM
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HYPER8oSoNic Offline
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Quote:






Quick and easy fix!! And yes for the bucks
it DOES WORK!!



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
Re: Thermoquad on RPM Air Gap [Re: HotRodDave] #832252
01/26/11 03:01 AM
01/26/11 03:01 AM
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Posts: 5,270
Missouri
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MY340 Offline
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Missouri
Quote:

Why do you guys assume an adapter is robbing HP? Many Many guys find they go faster with a spacre and an adapter is almost the very same thing. Mabey I am the only one who does this but I like to take the adapter, bolt it on the intake and port it to smooth the transition till it is like one single piece of aluminum, thats how I roll with them on intakes not desighned for them and they seem to work VERY good. If you do that there is just no where for the HP to disapear

Not all M1s BTW can have a t-quad bolted right on and since he is talking about air-gaps and LD340 intakes it sounds like he wants a dual plane and the t-quad will not bolt to a M1 dual plane, onlyt the M1 single plane.




I used a 850cfm TQ and adaptor on my Performer RPM manifold and it worked great on my previous Duster. Much better all around performance than the squarebore Carter AFB 625 I was running. The top end power was soooo much better. With the adaptor and thick gaskets I cut a hole in the hood for the scoop so I could run a taller air cleaner.


1970 FE5 Duster 360/904/3.91's SOLD 1973 TB3 SpaceDuster 340/4spd/4.10's SOLD Moparless for now but when the opportunity is right I'll have another one.
Re: Thermoquad on RPM Air Gap [Re: MY340] #832253
01/26/11 10:31 PM
01/26/11 10:31 PM
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Posts: 68
southeast NE
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lemondana Offline
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southeast NE
Remember the Holley Strip Dominator-the first AirGap! With a TQ flange yet to. They are on Ebay once in awhile.

Re: Thermoquad on RPM Air Gap [Re: lemondana] #832254
01/27/11 10:14 PM
01/27/11 10:14 PM
Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
boydsdodge Offline OP
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boydsdodge  Offline OP
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Toronto, Ont, Canada
Thanks all for the thoughts, I was originally asking about the Airgap because i was having a hard time finding an LD340 to use with the Thermoquad.
I have found the LD340 I was after and all will be right with the world and my Thermoquad.
Mostly I was checking to see if any one had ever done the welding to an Airgap and had a Thermoquad bolted up.
Thanks again.

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