30 replies to this topic

[Miniac86]

Were the HIF44 carbs around back in the 50's-60's?

[MIGLIACARS]

1958 is it not a mini?????

 

there was no hif 44 in 1958

 

h1 h2 h4 are the carbs back then in su turms

 

 

you will be lucky to get big power with an old shorrock s/c

 

 

you can get as much power as you want with a modern day blower such as a rotrex.

 

mine is on fuel injection and at the wheels does 167hp that is limited 

if i wanted more id just rev it harder     or fit the bigger charger.

[kezzkitkat]

I think hif 44 were around the early 80s
Just go turbo for mega hp
Saying that the podifold manifold for the supercharged look intresting might gain a few hp

[Cooperman]

There were no Minis in 1958  .

If it for historic rallies all modifications must be 'period' and a 1330 cc Mini will be 1964 vintage onwards, so a Shorrock can be used so long as there is evidence of its use in rallying in that period. I can't recall a 'blown' Cooper 'S' 1275 back then, although there were some Shorrock blown 850's around in the early '60's.

For rallying pay more attention to maximum torque figures rather than out-and-out bhp.

[grumpy dad]

hi

yes not a mini Austin A35

Le Jog is the longest rally we have done in it

runs in 12 car events in Kent

might enter HRCR clubmans agan next year 

 

yes Torque thats why a supercharger 

I have found a Judson in USA that was for a MGA

so could possibly under drive it so not to much heat

am I right in thinking that f you have 14 pounds of boost you double the horse power

thats why the card question 

[BaileyPerformance]

hi

yes not a mini Austin A35

Le Jog is the longest rally we have done in it

runs in 12 car events in Kent

might enter HRCR clubmans agan next year 

 

yes Torque thats why a supercharger 

I have found a Judson in USA that was for a MGA

so could possibly under drive it so not to much heat

am I right in thinking that f you have 14 pounds of boost you double the horse power

thats why the card question 

Hi,

Doubling the horse power is possible if the engine is in good order, its not possible to be sure 14PSI will double the power as it depends on the breathing ability of the engine. If you boost gauge says 14PSI it doesn't mean that boost is getting into the cylinders - restrictions like the manifold, head and cam profile affect the efficiency.

14PSI is alot of boost for a non-intercooled supercharger setup, if the engine breathes well you may need less boost to achieve your goal, but if its stock then your going to struggle.

 

For example, a we did a metro turbo some years back, stock everything, with 14PSI, some fuelling and ignition changes it made 110BHP. (an NA 1275 will make about 70BHP)

A supercharger and running the same boost generally makes abit less power due to the loss driving the blower, but the throttle response is better than a turbo.

 

We are happy to help you with your conversion and any info you need.

 

Cheers Dale.

 

www.facebook.com/baileyperformance

www.baileyperformance.co.uk

[OzOAP]

 

 

This is the last two Shorrocks engines I built. Top one is based a 850, the other a Cooper 997.

Both run H4 SU carb.

The 850 was a bit more modified and had 72 hp on dyno, the 997 had 76.

[BaileyPerformance]

Good power for small capacity, what boost where you running and at what total timing?

 

We see 49-51bhp on stock 998's for class 1 autograss

 

We mapped a 1071 cooper (on max oversize) for autograss, it made 92BHP on fuel injection and coilpack which is good power but not really usable on the road. At least with a blower the engine becomes more tractable and usable compared to NA with a mad cam.

[OzOAP]

On that dyno a std 997 would show high 40s hp, so with mild tweeks and blower it is about a 65% power increase.
Running 8lb boost and 32 deg full advance.
Two limiting factors on the 997. It has std 3 syncro box so aim was std Cooper S power and wanted to keep blower to 6000 rev limit. With pullys I had made, the engine is at 6500 when the blower is at 6000. 
The power is still climbing at 6000 revs.
The nice thing with the blown 997 is the torque curve. Over 60lb of torque from 1500 to 6000 revs.
Have done 5 Shorrocks engines over the years, not sure where other dyno sheets are. I'll have a dig around.
 

 

Edited by OzOAP, 15 November 2014 - 08:30 AM.

[Gr4h4m]

Are they corrected flywheel figures?

[OzOAP]

Yes.

[wayne miller]

Very Nice Oz

[BaileyPerformance]

Oz, nice work.

 

34deg seems alot of timing at 8PSI, do you find power is lost if you run less?

I think most Mini's run 34deg total NA, i would have expected 24-28

 

Any issues with detonation?

[OzOAP]

The 997 was 32 deg. No det problems.

[minivan79]

A HIF44 is still good at 300hp, although that's with a bit of nitrous too.

 

There are plenty of people running over 200hp with a HIF44.

 

Kezzkitkat, that Edens car by any chance?


Nitrous is to increase O2 densities thus requires more fuel input.