old school tunnel ram and carbs question

[Salvatore]

I don't think 2-600's are too big. The cam sounds appropriate. Need some good gears. JMO Sam

[BBIGG BLOCK 396]

Correct me if I am wrong,but I always heard that vacuum secondary carbs did not work on tunnel ram setups because the tunnel ram decreases the vacuum on the engine!I remember a long time ago that my brother had to change out his carbs to non vacuum secondaries in order to get it to run correctly.

Bobby Dodson

[whitetop]

[ QUOTE ]
Correct me if I am wrong,but I always heard that vacuum secondary carbs did not work on tunnel ram setups because the tunnel ram decreases the vacuum on the engine!I remember a long time ago that my brother had to change out his carbs to non vacuum secondaries in order to get it to run correctly.

[/ QUOTE ]

Was he possibly running too wild of a cam that produced no or little vacuum. Car Craft in the late '70's had a very extensive TR setup article for the street. All the pros who they interviewed recommended a VS carb. I think the jist of the article was for the street a VS only used as much gas as needed while a mechanical secondary gives you the gas whether you wanted it or not. I've also talked with many people who had cars like the Camaro posted above and asked them and it always came back to VS were best and that is what runs best on my car.

You have to remember we are talking street cars here with driveability as the goal. More show than go so to speak. Not a street/racecar. I was more concerned about my car restarting at a cruise and not popping/spitting etc. I am not concerned about the power.

[JoeG]

Motion had set up a 454 ZLX tr /(2)600cfm--513rear/hone---
Sam your right with the steeper gears with 1200cfm---But ....as Whitetop pointed out the smaller carbs just make life easier on the street--you could spend more time cruisin an less time tuning---JMHOX2----

VAC/MEC SEC---Would depend on cam/vac venturi size on carbs etc as whitetop pointed out and tr design--Whitetop seems to have a winning combo and you go with what works with your mods---

[JoeG]

Here's a photo of an edelbrock tr/(2) 600cfm carbs-str. linkage----From that Motion car---maybe this will help--Just some info

[whitetop]

"72 Camaro with sbc and TR-1X tunnel ram. I made a mistake on the carbs. The 1850 are 4160 models. I thought you had the 4700 series 4150 model. I had a TR-1X and the carbs fit fine inline. Personally I think the carbs look like crap when they are sideways. Reminds me of ET's Head. Also was there not a cartoon character called erasor head?

http://img.villagephotos.com/p/2004-...2/File0044.jpg

[Belair62]

Whitetop....phone home

[DirtyS]

[ QUOTE ]
Here's a photo of an edelbrock tr/(2) 600cfm carbs-str. linkage----From that Motion car---maybe this will help--Just some info

[/ QUOTE ]

If that is a Motion car it really makes me question some of the mystique and values floated around for them.

Looks like something the typical backyard guy would do with some rubber fuel line.

Not impressed.

[whitetop]

[ QUOTE ]
If that is a Motion car it really makes me question some of the mystique and values floated around for them.

Looks like something the typical backyard guy would do with some rubber fuel line.

Not impressed

[/ QUOTE ]


Part of that is it was the '70's and the detail was not as big a concern as today. Also you did not have all the hi-tech billet do-dadds and plumbing back then, you had to fabricate your own. Also to be honest Motion was not known for their neatness. I saw one pic and they added traction bars and spray painted them after instalation and had overspray all over the rearend and gas tank. On the V-8 Vega 454 that Motion did they just took a sledghammer and beat back the firewall. I think a dealership car built today along those lines would have had a custom firewall built IMHO because we have higher standards.

BTW, my mustang TR had a Moroso y-block mounted on a custom stainless steel mounting bracket. Looked much better than Motions setup but I have seen worse than Motions setups in old pics.

In regards to the rubber lines that is what people ran back then. Only the top fuelers and f/c's ran stainless steel braided lines. I started to see SSBL really taking off on street cars starting in the the mid '70's.

[Mr70]

Those were some primitive days & crude techniques.
Both at the speedshop AND Factory back then.