Rolling Road Dyno Day - John Sleath, Doncaster

martin172 · Post by **martin172** » Thu Dec 15, 2011 12:57 am

What engine capacity does it have and trick bits apart from the blower to generate that amount of horses?

H, Sunny 65 · Post by **H, Sunny 65** » Thu Dec 15, 2011 10:00 am

Hi Bob
Is that run, with the blow through carb, or did you change it?

bigbob · Post by **bigbob** » Thu Dec 15, 2011 11:03 am

It has come out higher than I was expecting. Its a stock 302 Motorsport crate engine, rated at 320bhp, with no mods other than the Rotrex centrifugal charger at 6psi going through a Demon 750 blow through 4 barrel carb with MSD ignition with boost retard timing function. I have been putting in some octane booster & super unleaded fuel to avoid pinking.
But my mate has a supercharged 347 in his Capri that puts out 700+ hp with a few mods. So 490 could be true.

V8 burble · Post by **V8 burble** » Thu Dec 15, 2011 7:19 pm

Here are two supercharged SBFs on engine dynos:

(302) @566 hp

http://www.youtube.com/watch?v=NACGYfWyyI0

(331) @702 hp

http://www.youtube.com/watch?v=ufltAe42 ... re=related

An engine dynamometer is the only way of accurately measuring flywheel horsepower. Unfortunately not many of us have access to such facilities.
A rolling road dyno is an extremely useful tool when used to correctly set up an engine for peak performance.

However, do beware of over-optimistic flywheel hp estimates which are simply based on rear wheel hp figures.

These two links may be helpful:

http://www.jkm.org.uk/performance/dynotesting.htm

http://www.pumaracing.co.uk/POWER3.htm

Regardless of the above, I am sure that bigbob's engine is producing some pretty impressive flywheel hp and torque.

gtsmrt · Post by **gtsmrt** » Fri Dec 16, 2011 7:01 am

Nice work Bob. A lot going on in your engine bay. Did you have to modify the inner guard for the supercharger?

bigbob · Post by **bigbob** » Fri Dec 16, 2011 1:15 pm

Its a very tight fit, but no mods were needed to inner wings. If the bonnet wasn't propped up to aid cooling, it would close with only a slight bulge needed to clear the hose off the top of supercharger. I am thinking of losing the stripes & badges & putting it back in stealth mode to suprise people.

Tomaselli · Post by **Tomaselli** » Fri Dec 16, 2011 1:31 pm

gtsmrt wrote:A lot going on in your engine bay

.... we are used to seeing it, bonnet is always up

gtsmrt · Post by **gtsmrt** » Fri Dec 16, 2011 10:42 pm

bigbob wrote:Its a very tight fit, but no mods were needed to inner wings. If the bonnet wasn't propped up to aid cooling, it would close with only a slight bulge needed to clear the hose off the top of supercharger. I am thinking of losing the stripes & badges & putting it back in stealth mode to suprise people.

Even in stealth mode wouldn't it still surprise people?

gtsmrt · Post by **gtsmrt** » Fri Dec 16, 2011 10:44 pm

Tomaselli wrote:
gtsmrt wrote:A lot going on in your engine bay
.... we are used to seeing it, bonnet is always up

Always tinkering or always broken down

Tomaselli · Post by **Tomaselli** » Fri Dec 16, 2011 10:59 pm

always 'fine tuning' for them extra horses

gtsmrt · Post by **gtsmrt** » Fri Dec 16, 2011 11:03 pm

Just change the pulley for extra boost... tyres may be an issue though

vkxbob · Post by **vkxbob** » Fri Mar 09, 2012 2:40 pm

Hi

Has this happened yet / is it still going ahead?

Cheers, Bob

Tomaselli · Post by **Tomaselli** » Fri Mar 09, 2012 5:05 pm

Bob,

Lack of real interest and so was postponed, with a date in the future yet to be agreed.

I'll put your name down as an interested party

vkxbob · Post by **vkxbob** » Sat Mar 10, 2012 6:15 pm

Thanks Tony

JoJoTiger · Post by **JoJoTiger** » Sun Mar 18, 2012 11:48 am

Hi Tony

If there is demand this year please add me to your list.

Regards

sunbeamtiger.co.uk

Rolling Road Dyno Day - John Sleath, Doncaster

Rolling Road Day