Engine Trouble, Kent 298 cam!!
Turbo Mini Forums

I'd start by checking that the carb butterfly is fully open

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi,

From all the responses I have received I think the first thing i need to do is time the cam in, even if this is not the only problem it will need doing in the long run to get the best out of it as at the moment it is fixed. Will be fitting one of these sets:

http://www.swiftune.com/Product/390/alloy-...g-gear-set.aspx

Once this is done i am going to try a different rolling road, and see if they can shed some more light on what went wrong, check fueling, timing etc.

If then there is still a problem then i think its going to need further investigation.

Opinions on this plan, more than welcome!!!

Cheers

Jon

Nice set of gears although perhaps a bit OTT :)

I just used an offset key on the standard (duplex) gears.

Personally I think I would measure the cam timing you have now - to see if that is the root cause of your problem - before deciding on your next course of action.

Edited by Rod S on 1st Dec, 2008.

Schrödinger's cat - so which one am I ???

Edited by Sprocket on 1st Dec, 2008.

I trust that you also have a decent LCB exhaust and RC40 or better system.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi,

I have this stage 1 kit from minispares:

http://minispares.com/Product.aspx?ty=pb&p...201%20KIT%20F...

I also fitted an electronic metro distributor that was bought with the engine.

What do you think?

Thanks

Jon

a stock dizzy will not cut it with that cam, youll need something like an aldon red, or pref a tailored dizzy, or ideally management like megajolt

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Agreed, a bit restrictive for that spec imo i'd go with this http://www.minispares.com/Product.aspx?ty=...XHAUST%20STAG...

Hi,

I am not too flush with cash at the moment and my company have just informed us there will be 95 redundencies out of about 500 so plan of action.

Get mini through MOT on friday, then im going to save up for a few months and fit better manifold, vernier duplex timing kit and a megajolt. Get all of this set up and take it back on the rollers and see what we can get then. The engine is running ok at the moment just not to its full potential so as long as its safe to run ill start saving.

Cheers

Jon

hi jonb

whatever the distibutor it has can be adjusted to atttain maximum power , it just may not be good elsewhere ,

the rr operator should have been able to do this .

a rc40 1.75 exhaust and average lcb would be enough for around 90 to 110 bhp with perhaps a little drop if the lcb isnt perfect ,but not enough to make it produce the present low power.


dont go off and spend spend spend on stuff that you dont need ,checking the cam timing is a matter of time and care ,,not of spending money .

the rr operator should have been able to tell you at the test what was wrong with the engine really ,if it was a proper tune and not just a power run .

regards robert

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I do not think that it is ignition timing related.

He is getting 82 Lb ft at 4400rpm. If he could carry that through to 6200rpm then he would be pulling 97hp.

Most if not all dizzies will have all the centrifugal advance in by 4400rpm.

The flat power curve suggests that at 4400rpm the engine has maxed out on air flow and from then on the VE drops.

Either cam timing or something silly.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

It's not just the lack of power that says cam timing, but the HC levels that went up with increasing revs instead of down.

The only other common reason for that HC behaviour is a persistent (but un-noticed) misfire - maybe due to the carbs or dizzy being changed ???

For a no cost check (assuming you have, or can borrow a DTI) surely check the cam timing first ???

Schrödinger's cat - so which one am I ???

And even if you discover cam timing needs a tweek, as someone has said already don't bother with a vernier timing set, just use an offset key.

Hi,

With this engine would you recommend running MAP or TPS megajolt??

Thanks

Jon

TPS

Edited by philc on 3rd Dec, 2008.