Todays rolling road
Turbo Mini Forums

Been to T&M in colchester today to have a check over, the only differences to my car from last time where a set of 1.3 rockers (previously 1.5) and i connected up my vacuum advance for a bit of off boost economy, thinking that the dizzy would back off to the locked timing on boost!!!

Well as suspected i gained a nice bit of low end power due to the lower lift rockers but lost 13bhp at the top end, this was until Ray sujested ditching my vacuum advance which got me back to 168bhp!! Exactly the same figure as last time but with a much smoother curve, all runs on 12psi.

It seemed that the vacuum advance was making the timing go all over the place under boost and giving some extra retard too.

I know certain cam/c-r/engine size combinations can gain by fitting 1.5 lift rockers but for me personally going to 1.3's was a right result

-MINI CLUBMAN 1380 TURBO-

Well who would have thought that!!!!!!!!!!

Bang goes the Book again!!!!!

Well done scrot!

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

So what'd it do on 1.5's without the vac can?

same power dave, 168!!! i connected the vac can between rolling roads, so the only difference is the rockers.

-MINI CLUBMAN 1380 TURBO-

yes that's why we NO there is no difference!!!! how shocking!!!

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

There is a difference, its alot smoother at the bottom end

-MINI CLUBMAN 1380 TURBO-

What cam profile are you using out of interest?

Kent 276

-MINI CLUBMAN 1380 TURBO-

276 really!

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

you are just a knob t3 lol.

i hope you will thank me in the usal way of getting you to be the guiny pig.

but i did say it would be better at the bottom but you may lose ssome at the top but i am well suprised you didnt lose any thing.

i still recon that the overlap has soemthing to do with it.

can you drive in 4th yet at 30 and pull away smoothly.

if my cam is shagged then i will refit my 276 i think for this next build.

well done bud see you at coombe

always looking for them bigger bunches of bannanas

Hmm I think I'll be adding some 1.3 rockers to my wish list

http://mini.twisted-design.net/blog/

1.3 rockers come free with every mini engine......

*blushes*

http://mini.twisted-design.net/blog/

WWW.TURBO-MINI.COM

[quote=turbo hogster,20/09/2005 20:09:09]

can you drive in 4th yet at 30 and pull away smoothly.

Tick over is alot smoother, 30mph in 4th is nice now with only the occasional little hic-up. The banana graph is also now much smoother especially at the top end!!

-MINI CLUBMAN 1380 TURBO-

1.3 rockers all round then!!!!!!!!!!!

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

nice to see true epxerimentation put into practice rather than just theory,s.

and reaping the results jammy scrot

always looking for them bigger bunches of bannanas

BIG YES MATE lol

IF LITTLE OLD BOY FELL IN A BUCKET OF S_IT HE WOULD COME OUT SMELLING VERY SWEAT!

SAY NO MORE...... I love you realy!

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

turbo phil

the old pressed steel rockers which were fitted to many A series in the 70s are 1.3:1 ratio

on this rebuild i am fitting minispares 1.3:1 roller rockers with plain shaft

& trying a phase 2 out

The sintered ones do vary a lot, from tolerances of where they bored the hole in them to fit the shaft through, after they had been pressed and "cooked".

By a bit of trial and error, and about 12 sets of standard rockers, it is possible to make up a set that are truly about 1.28:1 ratio......

The 1.3 roller rockers don't give enough of an increase over standard to justify spending ?150 on them, was the point I was trying to make anyway! They are worth it though if you are using a radical cam profile and need the increased reliability of the rollers to stop sideloading the guides.

changed to 1:5 from 1:3 about 4 years ago and gained 6 bhp, but also gained 12 ibft, all top end which was where i wanted it but i don't have to use it very often on the road. sounds like you've got a very well set up unit

Edited by andy c on 26th Sep, 2005.