What BHP would you say I have?

[anonymous-user]

I don't want to take it on a rolling road due to engine stress but here is a list of the engine mods. Have an estimated guess please.
1275 Engine
Stage 5 head
276 cam
1:5:1 roller tip rockers
Twin 1"5 Su carbs
All the good electrical things
Maniflow 3 into 1 manifold
RC40 single silencer box

Other mods I have are things that wouldn't increase BHP like an ultralight flywheel.

I'd be happy to think I have over 80...not sure though.

[haynes]

The engine will be under stress and underpowered too if its running lean when youre booting it!

[anonymous-user]

haynes said:

The engine will be under stress and underpowered too if its running lean when youre booting it!

I've had my uncle set it all up for me. Mixture is very good, cam timings are within 2degrees, rockers were spot on.

[camelotr]

A well-built engine should not have any problems on the dyno. Top power is only applied for a short period.
Did Your relative set the mixture with a wide band oxigen sensor? There is no other way to do it properly. Much more harm can occure from a "good-by-feel" carburation than from a rolling road session.

[camelotr]

BTW this setup should be over 100 bhps at the flywheel.

Much depends on the "stage5" head though.

Edited by camelotr on Tuesday 8th May 23:03

[Phil Hill]

Based on having a similar spec'd 1380 in the past I'd say 70 at the wheels.

What static compression are you running ??

Why the reluctance to dyno it ?? You really cannot tell what the fuel and sparks are doing under load unless you have it set up properly on a dyno.

Phil.

[anonymous-user]

I don't know much in any extreme details as I mentioned my uncle set it up....I've just seen too many cars blow up on them! Blame youtube.

[Ben Magoo]

FWIW we dyno engines and cars every day of the week (race tuned and stroked 4 pots and v8's both of which rev to 10500rpm!)and failures are really quite rare.

If your motor's been built properly with care a rolling road tune will do nothing but good.

[anonymous-user]

Well being in the Midlands I'm stuck for choice with Mini tuning places, guess I'll look into it..If it goes bang though I'm coming for you all

[camelotr]

Good build quality, good oil (!), enough cooling and a wide band oxigen sensor in an experts hand.
No real risk.

If still afraid, dont let them rev it above 6k.

We just measured our rally car yesterday. 8k and still in one piece. Though max power was at 7100.

http://www.youtube.com/watch?feature=player_embedd...

[FWDRacer]

Book up a session with Peter Baldwin. Nice drive over to Cambridgshire and let the acknowledged expert set it up. Most set-up by ear is way too rich and you could be washing the bores and compromising the long term reliability of the engine.

I'm happy to let Peter run my se7en to 8.5K on his rollers.

As for engine spec - it should be good for 100+ on Peter's rollers. They read high - this is a given, but it does wonders for your pub bragging rights

[camelotr]

Sorry for an offtopic question, but may I ask You FWDracer what kind of oil do You use in the se7en?

(btw respect for racing in the se7en league)

[guru_1071]

FWDRacer said:

I'm happy to let Peter run my se7en to 8.5K on his rollers.

i used to have a bit of in car footage looking out the back window of my race car that showed my brother going from 4th to 3rd and cogging it into first by accident!, he just rammed it back into fourth, back into third and carried on - the engine made a 'interesting' noise and puffed a bit of smoke out.

i ranted at him a bit, then promptly did the same thing the next race........


the rev counter went past 10.........

the car finished both races, the second time, it just bent one valve a little

[FWDRacer]

camelotr said:

Sorry for an offtopic question, but may I ask You FWDracer what kind of oil do You use in the se7en?

(btw respect for racing in the se7en league)

Valvoline Racing 20/50 Mineral. Very good drop of oil - the dogbox gets a level of protection not offered by synthetics.

[camelotr]

Thanks!

Whats the problem with syntetics?

[camelotr]

guru_1071 said:

the rev counter went past 10.........

OMG.

[haynes]

camelotr said:

Thanks!

Whats the problem with syntetics?

I guess they're too thin - in a mini the engine oil is gearbox oil too. I remember thinking i would 'treat' my min to some at the time very expensive mobile 1, wasnt long after that gearbox went bang.

[FWDRacer]

Synthetics - they find every exit point from an A-series Engine/box (of which there are many )... and in order to protect the box you need oils with high zinc contect. Very little zinc in most modern synths as they contiminate catalysts and poison them when burnt. Synthetics base protection is based on long chain molecules structure, the A-series gearbox in sump quite literally cuts and chews them up. So many downsides of synthetics I can't imagine why anyone would use'em tbh.

Have I mentioned hot oil pressure?

Good quality minerals all the way... Millers/Valvoline etc.

Don't get Cooperman started on weasel p!ss oils...

[camelotr]

I normaly use mineral 20/50 in road minis, but now I am tempted to use 15w50 sytetic. It was developed for motor racing, where engine does share its oil with the gearbox.

[Wodja]

That spec wont make 100bhp at the flywheel. id say more like 75-80bhp tops