Tunnel RAM EFI conversion

[Guest Bob L]

Hi guys,

I'm interested in thoughts on converting a tunnel ram (big block) to EFI, with the throttle body on the front of the tunnel ram and the top closed off.

Here's a couple of pics of the tunnel rams:

http://www.profilerperformance.com/tunnelram-spreadport-170.html

http://www.profilerperformance.com/tunnelram-spreadport-187.html

 

The motivation is to lower the overall height of the intake system. It would be straightforward to mill an opening in the front for the throttle body. It would then resemble the layout of an LT1 intake (except for size).

 

Any thoughts as to how well something like this would breathe? Suggestions?

[grumpyvette]

 

it can be built, Id use the HOLLEY base simply because its cheaper and flows better than any heads Ive seen,but youll have one huge problem, even the mono blade throttle bodies max out at about 1250cfm while the intake flows well over 2000cfm

you might want to think it over for several reasons

heres a bbc constant flow injection systtem I convered to EFI on my 1968 corvette, converted too EFI the intake is available now, it makes great torque, has a better throttle responce than any comom plenum efi can

 

 

 

 

IVE also built and tested my own design of custom sbc EFI intake like the one below, so having worked with both Id say a BBC needs the other design or twin throttle bodies

[Guest Bob L]

Great info. I like the fact the the air doesn't need to make any sharp changes in direction with the IR manifold. I just called up Kinsler - the crossram setup is about $6K, excluding the electronics. Ouch.

 

Any thoughts as to how this setup would flow compared to a throttle body on an Edelbrock Victor manifold?

 

Thanks,

Bob

[grumpyvette]

first

you can on occasionally buy those bbc constant flow mechanical injection units for about $1500-$2500 used on EBAY

second

you can convert to EFI for under $1000 if you do the work

third

if your willing to use vertical stacks those are more comon systems and sell used for under $1000 frequently

fourth

http://www.azspeed-marine.com/azspeed/gmraup.html

 

http://www.sallee-chevrolet.com/Photos/accp.html

 

[Guest Bob L]

Thanks for the info Grumpyvette.

 

I checked ebay for a Kinsler, no joy. But I'll add it to the list of things I look for. The overall height of the crossram setup is high - according to Kinsler it's a little less than 13" Does this seem right?

 

Any thoughts as to how a (converted) constant flow system would compare to a good single plane manifold + throttle body? The latter approach is certainly more common.

 

Much obliged for the info.

 

Best,

Bob

[grumpyvette]

 

heres what I bought for my efi bbc swap in the current corvette engine swap

yeah its going to cost me about 20-25 hp over a converted kinsler injection but it will also fit under the hood and can still make about 700hp befor the intake starts to limit the engine without porting it

[grumpyvette]

http://www.chevytalk.org/threads/showflat.php?Cat=&Board=UBB64&Number=553481&Forum=UBB64&Words=webber&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=allposts&Main=551251&Search=true#Post553481

 

you might want too look this over