BBC thoughts

General engine tech -- Drag Racing to Circle Track

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Re: BBC thoughts

Postby prairiehotrodder » Tue Aug 15, 2017 9:46 pm

are you teasing me? If i change the tail lights it requires a different cam.
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Re: BBC thoughts

Postby Old School » Tue Aug 15, 2017 9:48 pm

statsystems wrote:
prairiehotrodder wrote:Electric water pump, electric fan are now on the car and the cam is in at 103 ICL from 108. Good September air is coming soon.
Looked at a couple tunnel rams today. The Weiand and the Edelbrock Victor are my main 2 choices. The Eddy looks to have shorter, straighter ports while the Weiand is taller more curved. The Weiand is also cheaper.
Brian



You do realize a TR takes a different cam than a single 4 right?


What will be different? If I have a cam with .740 lift, 270-280@ .050 110 lobe separation what will the tunnel ram cam specs be?

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Re: BBC thoughts

Postby cgarb » Tue Aug 15, 2017 10:16 pm

271/281 @.050...lol

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Re: BBC thoughts

Postby RevTheory » Wed Aug 16, 2017 6:33 am

I've heard that a dozen times on here but I've yet to hear a single person say what needs to be changed.

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Re: BBC thoughts

Postby 77cruiser » Wed Aug 16, 2017 8:08 am

It needs a blower. :wink:
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Re: BBC thoughts

Postby cstraub » Wed Aug 16, 2017 9:08 am

statsystems wrote:
prairiehotrodder wrote:Electric water pump, electric fan are now on the car and the cam is in at 103 ICL from 108. Good September air is coming soon.
Looked at a couple tunnel rams today. The Weiand and the Edelbrock Victor are my main 2 choices. The Eddy looks to have shorter, straighter ports while the Weiand is taller more curved. The Weiand is also cheaper.
Brian



You do realize a TR takes a different cam than a single 4 right?


I disagree. If you don't change the demand or the heads then the same cam will work. Tunnel ram will increase the power throughout the same range as the single plane. Average power increase.
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Re: BBC thoughts

Postby statsystems » Wed Aug 16, 2017 10:15 am

prairiehotrodder wrote:are you teasing me? If i change the tail lights it requires a different cam.



How many tunnel Rams have you used? And tuned?


You can do what ever you want. Being a smart ass doesn't help.

As a GENERAL RULE, unless you have something really [DELETE THIS POST] up, you can take 4-6* off the duration and pull the LSA back 3-4 degrees.

If you don't, the engine will run up higher and loose mid range power.

If you can't call a good cam grinder and ask them, that on use. I started using TR's in 1982 and still use them. The ONLY exception is the car I have now, as I don't want to cut up the hood or change it. Otherwise it would have a TR on it now. In fact, the TR is in the shop, under the bench.


Go back and read all the comic book tests done on TR's, or even on any intake and see how many times they change the cam to match the intake, let alone the carb.

Bull shit dyno tests.

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Re: BBC thoughts

Postby statsystems » Wed Aug 16, 2017 10:16 am

cstraub wrote:
statsystems wrote:
prairiehotrodder wrote:Electric water pump, electric fan are now on the car and the cam is in at 103 ICL from 108. Good September air is coming soon.
Looked at a couple tunnel rams today. The Weiand and the Edelbrock Victor are my main 2 choices. The Eddy looks to have shorter, straighter ports while the Weiand is taller more curved. The Weiand is also cheaper.
Brian



You do realize a TR takes a different cam than a single 4 right?


I disagree. If you don't change the demand or the heads then the same cam will work. Tunnel ram will increase the power throughout the same range as the single plane. Average power increase.



I agree, if the heads are holding up. Most of the time they aren't.

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Re: BBC thoughts

Postby prairiehotrodder » Wed Aug 16, 2017 11:30 am

i believe you. Your short post seemed sarcastic thats all.
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Re: BBC thoughts

Postby statsystems » Wed Aug 16, 2017 1:38 pm

prairiehotrodder wrote:i believe you. Your short post seemed sarcastic thats all.



I didn't mean to sound sarcastic. I said it because they should call for two different lobes. 9 times out of 10, the heads aren't holding up the induction. The intake is. So the cam is chosen to help a weak induction make power to whatever RPM you want. Then you take the cork out of the system, and use the same cam. Peak power goes up, as will peak power. But the mid takes a giant shit. That means at the gear change and pulling back the gear change, the car will be slower.

That's why peak numbers can go up, but not gain ET. I've seen it many times. I've been using TR's on street cars for decades. If you don't mind a hole in the hood or a scoop there is no reason not to do one.

The exception would be the cross ram. I love those things. If I could find one that I wouldn't have to send my wife into whoredom to afford I'd do another one. They take some work, but they will work.

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Re: BBC thoughts

Postby F-BIRD'88 » Wed Aug 16, 2017 1:40 pm

You can get that change (if nessessary) to see, using that current cam by playing with the lash setting and installed phasing, It is advanced now, so.....

But that is a good reason why I wanted you to keep the Straub roller cam too.

IMHO
The big Edelbrock Vic Ram may give up a bit down very low
(it really likes to rev up and make top power) But the Weiand hi ram will gain everywhere that matters on this street car with 10:1cr.



The heads are fine..

One thing I like about the Edelbrock Victor Ram is you can take the top off and play with the internal plenum shape and volume.
EG: if say you want a longer effective intake runner length add a filler insert that fills the whole floor of the plenum with new raised runner entrances, then add a spacer to the top to readjust carb height and plenum net volume. This makes that tunnel ram Tunable/adjustable.
Filler inserts (contour and volume) in the tunnel ram Plenum need not be permanent.

Not as easy (but not impossible) on the Weiand.
The Weiand is tuned to a lower rpm resonance (runner length) and I believe the runner cros section is going to be smaller than the VIc Ram. The Victor Ram 2R is a serious piece and will tend to want more compression ratio, cam duration and RPM.

BigJoe1 may be a good person to get advice on which intake will be best for you
on this 10:1 motor and which will be best on a 555 with more cr.

You might PM him.

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Re: BBC thoughts

Postby F-BIRD'88 » Wed Aug 16, 2017 1:50 pm

I'd still like you to try the 2x4's on a carb adapter, for grins. :D
You'll be screaming my name like a B%^^&&^% all the way down the 1/4 HA HA HA

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Re: BBC thoughts

Postby F-BIRD'88 » Wed Aug 16, 2017 2:42 pm

You might say that having 2x4 carbs on a carb adapter, on your supervic single 4bbl manifold might look kind of wonky,, but need not be at all if when enclosed in a cool "shaker" hood scoop with integral carb box attached.
using this
Image

Inside the scoop there is enough room for a fabricated "precleaner" filter
to both take the big dirt out of the fresh air and slow- and straighten the in flow
a bit. Now the carb(s) will meter properly at high vehicle speed... This will keep the dirt out of your expensive street 540 BBC, protecting your $investment$.

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Re: BBC thoughts

Postby MadBill » Wed Aug 16, 2017 5:29 pm

statsystems wrote:...The exception would be the cross ram. I love those things. If I could find one that I wouldn't have to send my wife into whoredom to afford I'd do another one. They take some work, but they will work.


Like this?
David Vizard and others say that stock, the dual plenum designs like mine here (previously converted to Lucas timed MFI), have terrible distribution/resonance issues, hence I'll fabricate a much larger balance duct for A-B testing when I get my 498" BBC together.

DSCN2256.JPG
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Re: BBC thoughts

Postby cstraub » Wed Aug 16, 2017 5:33 pm

MadBill wrote:
statsystems wrote:...The exception would be the cross ram. I love those things. If I could find one that I wouldn't have to send my wife into whoredom to afford I'd do another one. They take some work, but they will work.


Like this?
David Vizard and others say that stock, the dual plenum designs like mine here (previously converted to Lucas timed MFI), have terrible distribution/resonance issues, hence I'll fabricate a much larger balance duct for A-B testing when I get my 498" BBC together.

DSCN2256.JPG


I did a cam for for DZ302 with a factory ram on it. Tom Vigue built the engine and his experience and mine (minimal to his in dyno test) it was the strangest power ever. It basically made 475HP from 6000 to 7500....didn't move.
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www.distributorgears.com


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