Detonation on #6 cylinder - how common?

[JonRB]

Hi folks

I need to put together some documentary evidence that there is a known issue, even if an uncommon one, of detonation on #6 cylinder.

Or, to put it another way, I need to prove that it happening to my engine is a not a totally unknown freak one-off event. If you see what I mean.

Can anyone help me on this please?

Very many thanks in anticipation
Jon

[Vixpy1]

I've lost count of the number of speed six engines in that were detonating.

[JonRB]

Vixpy1 said:

I've lost count of the number of speed six engines in that were detonating.

Nooo, not that sort of detonation Charlie.

[Vixpy1]

JonRB said:

Vixpy1 said:

I've lost count of the number of speed six engines in that were detonating.

Nooo, not that sort of detonation Charlie.

You mean as in Knock, or complete failure?

I was talking about knock, which of coarse leads to the second part

[JonRB]

Vixpy1 said:

You mean as in knock, or complete failure?

The latter. Although the word "catastrophic" is probably more apt than "complete".

[custardkid]

could be due to detonation???

http://www.pistonheads.co.uk/gassing/topic.asp?h=0...

custard

[Vixpy1]

JonRB said:

Vixpy1 said:

You mean as in knock, or complete failure?

The latter. Although the word "catastrophic" is probably more apt than "complete".

It will almost certainly have been caused by det, the speed six as standard seems to run quite lean (13.5:1) And alot of them seem to knock.

[JonRB]

Oh, we know it is detonation that caused the engine failure. That's not being debated.

What we wish to do is prove that this is not a freak one-off occurrence and that other S6 engines have suffered this and/or that it is a known issue.

And if the detonation had nothing to do with the #6 injector then that would be even better.

[Vixpy1]

JonRB said:

.

What we wish to do is prove that this is not a freak one-off occurrence and that other S6 engines have suffered this and/or that it is a known issue.

And if the detonation had nothing to do with the #6 injector then that would be even better.

Yes, its a known issue, yes lots of others suffer from it, and as far as i know, its not prevelant on one particlar cylinder.

[Hoolio]

Jon, if you want some "independant" advice can I suggest you call Jason @ SRT8 SIX.

When he re-built my T350 he said that #6 was an issue.

[tail slide]

Vixpy1 said:

Yes, its a known issue, yes lots of others suffer from it, and as far as i know, its not prevelant on one particlar cylinder.

Agreed, and had it on my 4-litre recently leading to overheating problems, mostly in 3 rearmost cylinders.

Dulford are re-assembling with a number of their further race-proved tweaks from other engines, to liners/special headgasket/cooling etc as belt & braces measures for a spec that should handle far higher pressures/heat than it will have (eg if it was supercharged).

Helpfully, mods not expensive if engine is out anyway, and we'll durability-test it in sprints/trackdays & road for rest of season.

Edited by tail slide on Wednesday 20th August 18:21

[S5TVR]

Speak to Paul at Austec as it is a known issue - not sure if it affects some cylinders more than others - I think it does. Running lean is not good for SP6 engines which is an aspect that Paul adresses when he re-maps them (highly recommended).

[tail slide]

S5TVR said:

Speak to Paul at Austec as it is a known issue - not sure if it affects some cylinders more than others - I think it does. Running lean is not good for SP6 engines which is an aspect that Paul adresses when he re-maps them (highly recommended).

Re-mapped mine very thoroughly - took a day.

(my probs were already there, and couldn't be solved with fuel/ignition, so map will be fine once those sorted)

[cptsideways]

You only need to blip the throttle on one to know they det!!!

Depends obviously on how they were mapped at the factory but my guess is they did'nt map individual cylinders just the whole lot in one go via a common exhaust lambda. Not the best way to map a factory engine


Timebombs like that imho