23 replies to this topic

[1977 Loud_Mini]

I agree with AndyMiniMad as the cylinder head is a big limiting factor to gaining power ut of an A series engine. Regarding 998's with the 1.5's I ran my 998 with flat top pistons with 12G295 head (ported, polished chambers), 266 camshaft and twin HIF38 carbs and the power with the 1.5's was still very noticable compared to standard rockers.
But i'd say try your luck with some head work first and then maybe the 1.5's will open up that little bit more power if you're not happy after that.

Evan.

[M44K TS]

Cool, I'll pester Green & White Mini's for some head work quotes

Cheers.

[mini 4o]

Cool, I'll pester Green & White Mini's for some head work quotes

Cheers.

Also take along your inlet and exhaust manifolds, so they can match them up to the head ports
That on its own can be worth 5hp and only cost time,

Imo 1.5 rockers have a 'feel good factor ' and do very little to increase power
Change the cam to a 266, and tune on a rolling road with someone who understands mini.

[Bungle]

So would 1.5 roller rockers make much difference to a 1275 that's already got a 266 cam and a stage 1 kit or would head work be the better route to go down for a bit extra power?

changing the cam to another 266 is a waist of time and money

[twrminisport]

Andyminimad: Did you try 1.3.1 roller rockers on your 998

And yes Bungle has a good point above. Real waste of time and money

[mini 4o]

[quote name='Bungle' changing the cam to another 266 is a waist of time and money.
[/quote]

Hi
My comments where made on the original post, in which Aidan wrote, "What else off I'm not too sure."

Without any history on the engine, the only thing I know is that Aidan is on the more power route,
I suggested fitting g a new 266 which is a good start to improve power at low cost,
At least then he will have a chance to check over the bottom end, in readiness for the next up grade.

But maybe I have missed something, or read into the op from the wrong direction, feel free to put me right if I have,

John

[Trials_Chizz]

I think camming the beast is the best option for money and power.

Thanks guys

Aidan

[AndyMiniMad.]

Andyminimad: Did you try 1.3.1 roller rockers on your 998

And yes Bungle has a good point above. Real waste of time and money

Errr....998....Oops sorry....Mine is a 1380 with all the toys....So yes fitting 1.5 roller tip rockers made a big difference to mine.

[MJWarren]

So would 1.5 roller rockers make much difference to a 1275 that's already got a 266 cam and a stage 1 kit or would head work be the better route to go down for a bit extra power?

changing the cam to another 266 is a waist of time and money

I agree, this wont do much at all apart from waist your money