CAMSHAFT CHOICE
Turbo Mini Forums

Hi all, question. CAM choice road application, whats the best as to give excellent road manners & best power figures who has tried what ???
thinking of kent 266? anyone tried this cam?

also what do you guys run for the quarter mile?
285 544 649? ? ? ?
who has tried what please.

iam new member to the forum
I HAVE BUILT 1293 unit with all the good guy internals
intercooler,vairable boost etc, etc have been developing this mini for several years, 25k i have in this.
will post pics soon for all to see.
cheers guys.

Benross:

avonbar phase2 can`t beat it for all round use

Everyone knows that instructions only have to be read if the thing doesn't work....

Avonbar's PH 2 is a popular choice, Works for me!

Anything racey, ie 649, don't bother!

I'm never sure if my answer to this question is valid. But my choice would be a KC500 with 1.5 rockers.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

wil, do you reckon a 500 with 1.5's would be good for drivability on the road or do you think 1.3's would be better ??
DAN :)

thats on a 998 by the way, forgot to say..
cheers

All Kent cams were designed using 1.5 rockers and always work better with them fitted.

It's really difficult to say what drivability on the road is like as I only ever drive the car flat out when racing.

On a 998, even with a very mild cam the problem is the boost threshold is very high (4000rpm with a T3 ).

If I was builiding a road 998 I'd probably run a higher CR than I do to help off-boost power. I run 7.3:1 atm.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

thanks guys for the input, all iam trying to gain here is a good forum on cams so keep it coming THANKS ALL
by the way running 8:5:1cr + intercooler

I have got a AR13T cam to go in my engine, it is an old Avonbar cam that I got with a load of stuff I bought, going to use it as it is a brand new cam not a regrind. Will let people know what its like, according to the guy at Avonbar it was a very good cam so am going to try it.

Im running a phase 2. Not done many miles at the mo but seems ok. Still pulls low down if needed but thats probably due to me running a std CR.

Blimey, one of my old cams the AR13T was great this was the original Phase 1 job, funnily enough i have been thinking of having these reintroduced, My old 1380 Turbo Metro that was also my race tow car was fitted with one of these cams.Good mid range power and smooth power delivery throughout.

http://www.avonbar.com

HI there Ian from AVONBAR
could you post some timing figures for the AR13T CAM
also the phase 2 the guys have been talking about.

would be well appreciated.
does the turbo units fitted with these cams respond well to 1:5 rockers as well? could do with usefull RPM band info on these.

ian what cam did the metro turbo challenge motors have ?

loads of questions but ! need answers

THANKS
BENROSS

my engine has apperntly got an avonbar phase 1 shaft in it but only got the blokes word for it who i bought the engine off

no longer a series, but still 1.3 turbo.

The Turbo Challenge cars had the Phase 1 cam which is 270 ish duration on the exhaust the phase 2 has 288 ish whereas the phase 3 has 300 ish We did move the lobe centres about!!
Now this is only my observation but i did and do not like 1.5 rockers on the Turbo motors, my old 1380 was nicer to drive without them.

http://www.avonbar.com

I can agree with that, my mini has turned into a dog since fitting 1.5's... I'm changing my cam next year, favouring lift instead of duration (and overlap)

also 1.5 kill cams as well, ever since fitting 1.5 roler tips every cam i have pulled out afetre a few thousand mile at least 1 or more lobes were well worn, the last one every inlet was f@cked , so my advice would be stick to 1.3 roller tips.

my 1380 turbo will be 1.3's and my 1.5 will be going on ebay i think.

turbo dave have a safe trip to septic land and buy they way i bet you will be back in blighty in less than a year, because my last tour to bosnia i was pissed of buy them in just 2 weeks( well 2 days to be precise).

plus ive just seen a car to shut up rich with and guess what its a moogy thou of all cars.

it does sport a 550 cossie 4x4 set up with noz and 0-60 in less than 3 secs.

sorry for the extra hyjacking of the post.

always looking for them bigger bunches of bannanas

is the cossie black sapp mate?

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

no you rodney the running gear was in a blue moggy thou, looks the pups privates

always looking for them bigger bunches of bannanas

i thought it was funny when you said "running gear" LOL

there is a black sapp 400 bhp with 100 shot of gas that can get into the high 2s.

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

I can see how 1.5s would kill a turbo (off boost anyway) as essentially they will increase the overlap.

With the Phase 2 fitted (and 1.5s) my power was somethong like 35bhp @ 3000rpm and 105bhp @ 4500, which is as you can imagine undrivable.

I haven't got a plot with the KC500 fitted but it is a lot easier to drive.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

1,5 rockers WILL NOT increase overlap. Timing figures remain the same. They only increase lift. Gs velocity will suffer as a result, increasing lag..

Yer, that's what I was meaning. I realise the timing of the cam remains the same, it's just the valves will be open more for the same period of time. This I think will give similar results to increacing the overlap (I.e. power higher up the rev range), therefore, 'effectively' increasing the overlap.

I still could be wrong, but that's the way I see it.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Just another point to raise about the cam wear, again most valve springs now available on the market place are TWO heavy in pounndage, we now machine down the spring seat platforms on our modified heads to reduce seat spring pressure which also releases xtra hp!@!!! and reduces wear. Ian

http://www.avonbar.com

ahh lots of conflicting ideas!
the main reason for longer exhaust duration and lift is to get the exhaust gases out effectively , this can also be done with a larger exhuast valve and porting more on the exhaust side reducing the need for a 'specific turbo' cam
many of you have experienced loss of drivabillity off boost using 1.5 rockers , i put it down to too larger ports /valves on the inlet reducing gas speed .
road engines requiring good running off boost is different to all out maximum power engines, drivabillity low down has to suffer in favour of on boost performance
cam chioce is a comprimise between cost effectivness, and extremly limited developement to cover the average turbo engine - no matter what you have been told!

Low port velocity definately isn't the case on my motor... The ports are near standard size (obviously opened out where it changes direction, but the 'runners' are basically as they left the factory!)

Someone needs to do some long needed development !!!