Hot Rods help with a tunnel ram

i have a 55 chevy g***er with a 348w strocker moter. it has a617 lift solid bulit cam and sheet metal tunnel ram intake. i have tried coming out from 2000 to 4500 hundred and it bogs bad then it picks up and runs real strong. the carbs are 650 eb and i have called them and there recomendation didn't help.i now have 95 primarys with 70\47 rods and 103 secondarys and losend the air doors I'm thinkin i need to tighen the air doors. i haven't been around hot rods since 1968 and since i retired I'm doing what i love that i didn't have time for til the last cople years. any advice would greatly apreciated. i am not good on a computer it took me a long to type this

 

Welcome..Need more info on the 55...Eng cube [484?] rear gear, trans and ratios , tire size, etc..You'll get better at typing the more you do!...

 

Besides what seb asked for be aware that tunnel rams require heat in the tunnel ram itself. It takes a while to get the engine heat into the tunnel ram. What are your timing settings,engine temps. What are your lm2 (air/gas ratio) readings? It may be to lean.

 

I've always had to put a lot bigger acc, pump squirter in carbs on tunnel rams. I think tightening up the secondaries would probably help cover the bog too. I never had to change jetting a whole lot, but you might go a little richer than stock to see if it helps.

Lots of initial timing and lots of rpms on the launch never hurt anything either.

Any pictures of the intake?

 

As others have said, need more info.
Gear ratio, trans. type, car weight are big needs to know. Also, how large is the plenum (cubic inches) and runner length ?
Note, the plenum should be no larger in cubic inches than the engine is in cubic inches.

Also as has been said, a much larger accelerator pump discharge is required now than with a more standard intake.

Mike

 

Throw the Edelbrock carbs away and get a pair of 600 Holleys set up for a tunnel ram. The Eldebrock is a good cruising carb, but the Holley is much better for what you want. Like was said, put the big squirters and big pump on the Holley and go racing.

 

^ And here ---a good read--- with a fix at the end----
model A hooligan
https://www.jalopyjournal.com/forum/threads/what-carb-for-tunnel-ram.1055456/

 

the engine is 434ci runing 456 gear and 30 inch tall slicks the cam is a roller and 12.5 comp the trans is a gforce with a3.02 first gear i found a muncie can't take the presure. the car weights 3400lb the acc.pump is in the top hole driving around the parking lot give it a little throtle and it breaks the tires loose. on the starting line i nail it and it boogs but when it catches it goes balls to the wall. it might help if i could train myself to ease into the throtle but thats hard to do and i thank you folks for your replies.

 

i am in ohio what carb doctor could be recommended.thank you

 

------ick

 

How heavy is your flywheel ? Have you ever tried a higher rpm launch? Your power band may require a 6 grand launch. Good traction at a drag strip will show off a bog if the rpm is too low.

 

If you can swing it, I would switch to Holley DPs and tune accordingly. I ran some edys on a tunnel ram years ago, and it took a lot of playing and tuning to get them to work right. IMO the holleys will work much better on your ram.

 

660 center squirters baby----- well, totally worked ,with 850 base plates, and OH so much more ...

 

Hell YEA! Love the 660 CS.

 

It sounds like you have the AVS series carbs.....if so you may need to tighten up the air flap.

 

Get Holleys. Mechanical secondaries, double pumpers. 600 should be fine.
Do you have a cam card you can post ?

 

Yes, I use 660 center squirts...i think 3500 is where my tunnel ram kicks in on bbc, your plenum may be bigger on a sheet metal intake tho....that may change the powerband

 

Flatheads totally worked too, until something better was introduced. Center squirters still work ok on a strip only car, but they aren't the only alternative now days.

These didn't bog. I was well satisfied with the way they performed on the street and strip, although I would have probably used double pumpers on a track only car.

 

the fly wheel is alumin 11in ramand the runners are 4.5 in long I'm thinkin about putin richer meetering rods and tight the air doors a little and try it. i have an orig**** 2 four in take that i guted that worked prety good that iwill have to run goin to some g***er events.thanks for the replies.

 

Eddy's work great on a tunnel ram. I put a pair on Indy tunnel ram on top of a 500 inch motor with a/t in a 64 Dodge. No bog.... Car ran 9:52 @140. Secret weapon.... Send them to Damon Kuhn in South Texas and let him work his magic.

Sent from my Moto G Play using The H.A.M.B. mobile app

 

You may want to install a steel flywheel.
Have you looked at the McQuillen intake?

 

Best ram out there IMO.

 

i talk to mcquillen and there is not enough meet on top. i raised the ports in my heads.had to have sheetmetal made. if i knew how to post pictures i would but i can barley turn this thing on and spell.

 

iwas looking in my book about meetering rods and the higher the number the leaner it is that seems backwards to me mine are 70 47 any one know which way to go leaner thanks.

 

You need an Edelbrock chart to decipher the metering rod/jet deal. Common sense doesn't work here.

OK, I see you might have the book. The numbers are the diameter of the two steps of the metering rod - cruise circuit and power circuit. The first two numbers are the cruise and the last two numbers are the power. If you're looking to lean out the power circuit the last two numbers need to be larger than 47.

The chart gives richer or leaner combinations and the percentages.

http://www.edelbrock.com/advertising/Literature/Misc/EDL_Carb_Tuning_Guide_0348.pdf

 

i messed up on last post i meant richer not leaner sorry about that.anybody need any mistakes i have plenty.

 

You may need a heavier flywheel to swing it out of the hole for drag racing . We used to adjust to track conditions by changing the flywheel. We carried a heavy flywheel when the track had a lot of bite and a really light flywheel for greasy tracks. Of course our car was set up to change it quickly.

 

What carbs are you running? 1825 maybe?

I'll agree that a heavier flywheel would help with the launch
.

 

The smaller the #the richer.