Tunnel Ram to EFI?
er...@postoffice.pacbell.net
My friend has done several single plane, single four-barrel manifold
conversions and he doesn't think that the tunnel ram lends itself to
conversion due to the injector mounting angle. I have heard several
conflicting views about this, but I have not been able to talk to anyone
that has actually done it.
I am using Bosch 48lb/hr. injectors, a Haltech controller, Oval-Port
454(and I don't want to hear anything about oval ports!), Two Bosch
throttle bodies . I would like to use either the Wiend or Eddellbrock
tunnel-rams.
Also, anybody out there have an aftermarket throttle body (4-barrel
style) for sale?
The boat that the setup is going into is a 19 1/2 ft. low profile,
semi-vee jet boat (lake style).
So, is there anybody that reads this group that actually works on their
boats? I am not a "Hot Boat Magazine" rich kid, just an engineer with
two kids that likes to go fast.
Any help or leads would be appreciated, and here in Northern California
the weather is getting perfect!
Thanks,
Eric.
Lifespeed
er...@pacbell.net wrote:
> Has anyone converted a tunnel-ram (Big Chevy) to EFI?
>
> My friend has done several single plane, single four-barrel manifold
> conversions and he doesn't think that the tunnel ram lends itself to
> conversion due to the injector mounting angle. I have heard several
> conflicting views about this, but I have not been able to talk to anyone
I haven't done it yet, but I'm going to. Not on a tunnel ram, but a Race Aero
twin turbo setup.
Tunnel rams are optimized to perform as wet manifolds. Using one with an EFI
setup is pointless. You've got no fuel flowing down the runners. It will
work, but won't gain you any HP over other properly sized manifolds. The main
points of concern with an EFI manifold are sizing the plenum and runner
volumes to correspond with your intended RPM range and engine size. A
properly designed manifold makes use of length and volume tuning to approach
or exceed 100% cylinder filling in the RPM range of interest. One of the many
improvements of (multiport) EFI is that the dry manifold allows you to
eliminate the compromises required to alleviate fuel puddling. A tunnel ram
is a high-rpm anti-fuel-puddling compromise.
If you're going to buy a manifold anyway, why not buy an EFI manifold? Yes,
they're more expensive. But new tunnel rams and throttle bodies aren't that
cheap either.
> I am using Bosch 48lb/hr. injectors, a Haltech controller, Oval-Port
> 454(and I don't want to hear anything about oval ports!), Two Bosch
> throttle bodies . I would like to use either the Wiend or Eddellbrock
> tunnel-rams.
Nothing wrong with oval ports on a 454. Rectangle ports really shine in the
3500 - 8000 rpm range. But you won't need that in a jet boat.
> Also, anybody out there have an aftermarket throttle body (4-barrel
> style) for sale?
>
> The boat that the setup is going into is a 19 1/2 ft. low profile,
> Any help or leads would be appreciated, and here in Northern California
> the weather is getting perfect!
Where are you located in North CA? What lakes do you go to? I'm in Santa Rosa,
and often go to the Delta, East Park Reservoir, or Berryessa.
--
- Lifespeed
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er...@postoffice.pacbell.net
boating and skiing the Sac Delta during the 70s. My dad's boat was a sleekcraft
with a big chevy. I have had a few boats including some Sanger flaties (used to
be able to take them on the Delta, but no more with the rich Alamo crowd and their
30'+ plus boats!), most with tunnel-rams and I love the way they look!
With a tunnel-ram, I can also use two Bosch throttle bodies (I pay about $30
apiece for them!) and most people wouldn't know what they were looking at.
As far as buying a new EFI manifold, I have not found anybody that will sell just
a manifold and throttle body. Besides $400 to $600 is way too much for a slab of
aluminum with four 1 11/16" holes and a mount for the TPS (this is for just the
throttle body).
I can convert a single plane much cheaper than helping to buy Vic Eddellbrock a
new retirement home by buying a "kit". Though, If I do give up on the Tunnel-Ram
idea, I am going to use either a Victor Jr. ( See, ol Vic will get my money
anyway!) or a Team-G. The guy that I know now that converts the manifolds has a
67 camaro with twin turbos on a 454 and EFI that he built himself, and it is a
beautiful installation as well as fast as hell!
I still ski the Delta, still end up at Lost Isle and still haven fun with my
boat. How is Berryessa, I have never been there even though I grew up less than
an hour away (the Delta is still closer).
And "Lifespeed", what kind of boat are you going to put twin-turbos on? Don't
forget a intercooler as you have the world's largest heatsink in a boat!
Intercoolers and Boats were made for each other.
Eric.
Lifespeed
er...@pacbell.net wrote:
> Yes, I realize that the tunnel ram is not the most logical choice, but I grew
up
> boating and skiing the Sac Delta during the 70s. My dad's boat was a
sleekcraft
> with a big chevy. I have had a few boats including some Sanger flaties (used
to
> be able to take them on the Delta, but no more with the rich Alamo crowd and
their
> 30'+ plus boats!), most with tunnel-rams and I love the way they look!
>
> With a tunnel-ram, I can also use two Bosch throttle bodies (I pay about $30
> apiece for them!) and most people wouldn't know what they were looking at.
>
> As far as buying a new EFI manifold, I have not found anybody that will sell
just
> a manifold and throttle body.
Have you checked with Arizone Speed and Marine? I believe they sell the
manifold, plenum, and throttle body independently.
Besides $400 to $600 is way too much for a slab of
> aluminum with four 1 11/16" holes and a mount for the TPS (this is for just
the
> throttle body).
>
> I can convert a single plane much cheaper than helping to buy Vic Eddellbrock
a
> new retirement home by buying a "kit". Though, If I do give up on the
Tunnel-Ram
> idea, I am going to use either a Victor Jr. ( See, ol Vic will get my money
> anyway!) or a Team-G. The guy that I know now that converts the manifolds has
a
> 67 camaro with twin turbos on a 454 and EFI that he built himself, and it is a
> beautiful installation as well as fast as hell!
>
> I still ski the Delta, still end up at Lost Isle and still haven fun with my
> boat. How is Berryessa, I have never been there even though I grew up less
than
> an hour away (the Delta is still closer).
It's a nice, large lake. Warm water. Good place to go during the week, if its
not windy. Plenty of room to open up and ski fast.
> And "Lifespeed", what kind of boat are you going to put twin-turbos on? Don't
> forget a intercooler as you have the world's largest heatsink in a boat!
> Intercoolers and Boats were made for each other.
The turbo installation is complete and running, with a Race Aero water/air
intercooler, Rajay turbos, AirResearch wastegates, and twin Holley DP's. I'm
currently upgrading the rudder and prop for the ski racing season. I would
very much like to install EFI, but that probably won't happen until later
this year.
The running gear issues are more pressing right now. It's installed in a 21'
Schiada.
er...@postoffice.pacbell.net
boating and skiing the Sac Delta during the 70s. My dad's boat was a sleekcraft
with a big chevy. I have had a few boats including some Sanger flaties (used to
be able to take them on the Delta, but no more with the rich Alamo crowd and their
30'+ plus boats!), most with tunnel-rams and I love the way they look!
With a tunnel-ram, I can also use two Bosch throttle bodies (I pay about $30
apiece for them!) and most people wouldn't know what they were looking at.
As far as buying a new EFI manifold, I have not found anybody that will sell just
a manifold and throttle body. Besides $400 to $600 is way too much for a slab of
aluminum with four 1 11/16" holes and a mount for the TPS (this is for just the
throttle body).
I was told to check with Blower Drive Service, but once again I am not looking for
a complete kit, I can build it myself cheaper and get exactly what I want.
I can convert a single plane much cheaper than helping to buy Vic Eddellbrock a
new retirement home by buying a "kit". Though, If I do give up on the Tunnel-Ram
idea, I am going to use either a Victor Jr. ( See, ol Vic will get my money
anyway!) or a Team-G. The guy that I know now that converts the manifolds has a
67 camaro with twin turbos on a 454 and EFI that he built himself, and it is a
beautiful installation as well as fast as hell!
I still ski the Delta, still end up at Lost Isle and still haven fun with my
boat. How is Berryessa, I have never been there even though I grew up less than
an hour away (the Delta is still closer).
And "Lifespeed", what kind of boat are you going to put twin-turbos on? Don't
forget a intercooler as you have the world's largest heatsink in a boat!
Intercoolers and Boats were made for each other.
Eric.