race n/a camshafts?
Turbo Mini Forums

Hi,
A friend and I have a project to race in historic class next year,
for this we just bough a 1974 red 1275gt .
Knowing how little waste time we have, this will be difficult to finish but hope and dreams make living...

That's way O/t on a turbo board, but I don't know a better board than this one, I'm sure you'll appreciate the project .
Cams have changed this last decade and have moved my knowledge in last century.
I'm looking for a 300° cam, but don't need it to rev past 7700,
what about med agsp, swift sw23,piper 649+, or str930.

I need something that give all his guts between 4500/500 and 7500 rpm.

Fabrice

STR930 is probably what you want looking at your revs, but bear in mind most of those guys you will race against probably use the 310SP

Paul

I seriously doubt it!

How about one of the russel engineering profiles?

thanks
Paul, do you think that we will be competitive with a 930 against 310 camed,I know a good engine which produce 135bhp with a 310, how many can I expect from a well built 930 ?
the fact that we'll have in the first time to use worked genuine components, cause lack of money to buy forged crank etc, reduce rpm possibility, what's worrying me is that some races like Le Mans will need power to be competitive.
I don't know much about Russel's profiles but the fact that Mr Calver reverted to a 930 is certainly a good point.

I used to run a 296 which gives similar power to a 930, when I fitted the 310 I gained 7 bananas and went 3 tenths quicker on the 1/4 mile. Read that as you will.
A forged crank is so unnecessary, I run a MED fully worked turbo crank to 9,500, it wont stay at those revs for long but an expensive crank wont do any better.

Paul

I seriously doubt it!

9500, that's some serious revs...for how many long did you kept your engine in one piece ? we will do 30minutes sessions at full throttle.
then I like when the five porter come on cam and trash the red line, so the cam should be a 310 and that's good enough for me as we have one just under the bench.
Fabrice

Well Im sure my engine would last aswell as a Miglia, I couldnt do 30 mins at full throttle though

Paul

I seriously doubt it!

that's not 30 continuous min,I was meaning that the race session was 30 min.If yours can last aswel as a miglia, you'd be nice to give some more advices, my head will be a longman 37/31, pistons +20 omega light, lightened 1275gt rods, if we go for the 310 then we just saved 200, they'll certainly go in med pocket to prep the crank.
Fabrice

I seriously doubt it!

tip top,
Ill post news and questions when the project will grow
Fabrice

fab yes the STR930

please have a look at the piper magnum 285

Hi Steve , I've used 544 and 285 cams, they're very good,
but this class is raced by 1960 cooper s, these guy have some budget, and i'm pretty sure that anything under 125 bhp will struggle an the end of the line, to be competive we really need at min 649/530 power .I thin that the best is to use a max of under the bench parts , and then upgrade the needed ones.
It's incredible that my turbo engine
with this phylosophie is still alive near one year later.. this five porter is sometimes stronger that we think
Fabrice

The prepped A+ rods will be about the same weight as prepped GT ones, but it takes MUCH more time to prep the GT ones.

I would also talk with SH engineering about a crank for this project!

The MED AGSP is a nice cam and showed 146 bananas on Baldwins dyno back in 04 - probably a real 135ish, I ran a 296 before this and this was a very good cam but did lack top end punch over 7500rpm - as Paul says my choice would be the agsp or the 310sp.

JK

If Carling made Mini engines
it would probably be like this one!

Hi John! could you give me a bit more about engine specs (cr, crank mains clearance, capacity).
have you got pics of prep gt rods
thanks all for you interest
Fab

I'm running a STR930 in my historic 1275GT, but I haven't been to the dyno yet. Seems to pull reasonable well from midrange, but has got a serious puch at 5500ish.

have a look at this spread sheet gives details on most cams

www.edhodson.com/personal/miniresto/Mini%20Cams.xls

Hi Veg!
are you racing with your 1275?
What about the rest of eng specs?
the 930 would certainly have my first vote,(the fact that Calver came back to it is certainly a good info) but then I've heard goods about the agsp and piper 649 one.
As you know these guy will not share what help them to win lol.
this link's interesting but timing isn't enough to choose a cam.
Then we arleady have a 310sp one. I'll start with it, and try the 930 later.will post the results.

I will be this summer I hope. If the Miglias use this, why not me I'm allowed everything they're allowed.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/