old school tunnel ram and carbs question

[JoeG]

engine whitetop--Are you running a straight linkage ie.-1 to 1 ratio or progressive setting on your linkage

[whitetop]

I'm running Weiand straight linkage. Not progressive. I think the part number is 4011 or something like that. Both of my carbs come out to 780 cfm which even on a little 289 is more than is recommended but it is the smallest 4150 carb available from Holley.
BTW Running a Crane cam, very mild. But it produces a ton of vacuum and torque which is needed to run a tr on the street.

[musclcar]

your getting me confused now you mention a 4150 carb "double pumper" then you mention a 4160 "vacum secondary.so what is better for my tunnel ram double pumpers or vacum secondary carbs. i don't think there is room on a TR1-X for 2 inline double pumper carbs.the vacum secondary carbs i've got now the bowls are seperated by less then a 1/2 inch between the front and rear carbs. so your saying a 600 cfm vacum secondary carb will be to much and i should go down to a 450cfm vacum secondary carb for better results.i bought 2 matched 600 cfm vac sec. carbs off of ebay for a good price and all they need is a rebuild. the camshaft that's in my motor right now is the GM #140 solid lifer cam and my compression is 11.5:1 and my rear gear is 3.73.

[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

[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.