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-   -   B2 Motorsports - Cliff Rosson All-Aluminum 331 SBF Build (http://www.clubcobra.com/forums/advertisers-forum/121353-b2-motorsports-cliff-rosson-all-aluminum-331-sbf-build.html)

blykins 09-25-2013 12:30 PM
Can't do that when going from a hydraulic to a solid. Too many differences between the two.

Even when you think about actual duration......a hydraulic lifter is always in contact with everything. A lifter on a solid cam has to move a distance before the rocker arm makes contact with the valve stem.

Lobe shapes are completely different...solid roller lobes are more aggressive and the lift will be greater.

ERA2076 09-25-2013 06:56 PM
O.K. - how much you going to make?

chr

blykins 09-25-2013 07:02 PM
I'd say a little under 1000. ;)

ERA Chas 09-25-2013 07:50 PM
Quote:
Originally Posted by blykins (Post 1264541)
I'd say a little under 1000. ;)
You building TWO engines for him?? :confused:

blykins 09-26-2013 02:58 AM
It was just a joke...just one engine.

I'm not real sure on how much hp we'll pick up.

ERA2076 09-26-2013 06:24 PM
I'm thinking 7 - 15.

ERA Chas 09-26-2013 07:39 PM
I think about 25 on the single carb-dunno about the Webers....

ERA2076 09-26-2013 09:42 PM
woa - that's getting up there. Maybe the Webs will de-tune some?

Dimis 09-26-2013 09:59 PM
Quote:
Originally Posted by ERA2076 (Post 1264728)
woa - that's getting up there. Maybe the Webs will de-tune some?
I'll take a stab and say 20hp.

Then when you switch intake to webers you'll lose 5-10hp at the high point but gain plenty through the middle.

Ehhh.... Just a wild guess, with zero engine build experience.... So don't take my word for it.

ERA2076 09-27-2013 12:46 PM
Quote:
Originally Posted by Dimis (Post 1264729)
I'll take a stab and say 20hp.

Then when you switch intake to webers you'll lose 5-10hp at the high point but gain plenty through the middle.

Ehhh.... Just a wild guess, with zero engine build experience.... So don't take my word for it.
Assuming 10hp drop - 442 and a fat middle - hope I can manage it.

chr

ERA2076 09-27-2013 12:51 PM
Will the peak torque necessarily move to the right?

x-chr

blykins 09-27-2013 02:17 PM
Peak torque rpm may not move, but I'd say peak torque will go down.

ERA2076 09-27-2013 05:58 PM
That's not necessarily a bad thing - :LOL:

How much you think you will lose?

chr

blykins 09-29-2013 05:26 AM
Checking in....

Cam is degreed and installed, timing cover, water pump, and oil pan are back on. Lifters have been grooved, washed, and installed. Got the heads all torn down, waiting on new retainers and some parts from T&D.

I'm hoping your engine will gain some performance by osmosis as well.....it's sitting beside of Jeff Lipton's 487FE, a 465 Tunnel Port FE, and a 428 CJ. :)

ERA2076 09-30-2013 12:08 PM
Getting nervous :LOL:

Forget the voodoo - that thing has plenty for what I am going to do with it.:cool:

Main thing is, it holds together - number one!!!

I am really excited about running it.

chr

ERA Chas 09-30-2013 02:01 PM
Quote:
Originally Posted by ERA2076 (Post 1265248)
Getting nervous :LOL:

Forget the voodoo - that thing has plenty for what I am going to do with it.:cool:

Main thing is, it holds together - number one!!!

I am really excited about running it.

chr
Cliff,
Why nervous? You did a ton of sophisticated work on chassis-I assume you have lots of track experience.
All Brent's engines have a throttle-you should only use what you're comfortable with. ;)
You could add a throttle stop (as I did) easily to limit WOT until you're comfortable-in my case, to prevent over-centering the linkage.

lippy 09-30-2013 02:57 PM
Quote:
Originally Posted by ERA Chas (Post 1265262)
Cliff,
Why nervous? You did a ton of sophisticated work on chassis-I assume you have lots of track experience.
All Brent's engines have a throttle-you should only use what you're comfortable with. ;)
You could add a throttle stop (as I did) easily to limit WOT until you're comfortable-in my case, to prevent over-centering the linkage.
What did you use as a throttle stop? Sounds like a good idea to get used to the car.

ERA Chas 09-30-2013 03:28 PM
Moroso makes it.

ERA2076 09-30-2013 03:35 PM
Quote:
Originally Posted by ERA Chas (Post 1265262)
Cliff,
Why nervous?
Forgot the question mark - that was for Brent. Nothing worse than tearing a perfectly good mill apart and putting back together to be disappointed.

Once he plays the voodoo, what am I to think :LOL:

Quote:
Originally Posted by ERA Chas (Post 1265262)
You did a ton of sophisticated work on chassis-I assume you have lots of track experience.
Hell No - but I did stay in a holiday inn express once. I enjoy autos and enjoy performance tech - I have been studying and playing with vehicle dynamics since the 80's - it really fascinates me. Skiied alot when I was younger and got thousands of miles on slippery surfaces (should have been jailed more than once). I finally got in a position to peruse on a track at some level and I am. My 5th driving event Sunday - can't wait.

Quote:
Originally Posted by ERA Chas (Post 1265262)
All Brent's engines have a throttle-you should only use what you're comfortable with. ;)
The throttle really does not scare me. One of my goals was to try to build to the spirit and balance of the originals (289 FIA USRRC) - the ERA is an advantage (chassis) I realize, but still, I do not want to get too far from the power to weight balance of the originals.

Quote:
Originally Posted by ERA Chas (Post 1265262)
You could add a throttle stop (as I did) easily to limit WOT until you're comfortable-in my case, to prevent over-centering the linkage.
Nah - I've been flogging my Mustang which is a very safe predictable car - we'll be o.k. (or we won't:))

[IMG]http://imageshack.us/a/img853/3234/6ypg.jpg[/IMG]

ERA Chas 09-30-2013 05:30 PM
You get a 'Like'.
That's also a freakin' cool shop you got....


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