Bit of a bang.
Turbo Mini Forums

Ran at shakey last weekend,first time for almost a year. Made a horlicks of the burnout,got off the line,then seemed to lose drive. Much frantic pedalling and stick waggling,in the middle of which were a couple of bangs(backfires?). Rolled into the runoff area with no drive in any gear and the engine idling at 3000 rpm.
Turns out I ripped the clutch to bits and the bangs were NOS explosions in the inlet. The carb damper rod had punched up through the plastic top cap. Now the question is what other damage to the carb/inlet system should I be looking for? Will the dump valves,MAP sensor,boost control have suffered?
Meanwhile engine/gearbox out,see what the damage is there.
As always any advice,comments,piss taking welcomed.

'Where does the engine go?'

oops hope you can save it

Done now needs redoing lol

I am sure this happened to matt woods (damper rod) that is maybe you could ask him?

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

I was thinking the same thing simon

Matt woods bent a con rod with a nitrous fart.

I'd suggest at least pulling all the manifold and cab and checking thoroughly, as a nitrous backfire can be damaging.

I was always nervous of the nitrous backfire. I know the Don has a blowout disc on the end of the plenum to prevent serious damage to the inlet tract in such an event. not sure how this could be adapted onto an A series manifold though

http://www.youtube.com/watch?v=aRYwrHQyJAM

Thanks for this I'll talk to Matt.The blowout disc sounds a good idea.I won't know just what happened until I pull it all apart,but the plenum is black inside.Not sure of the butterfly position either as the inlet ports look clean?

'Where does the engine go?'

Ok so back running again.I refreshed the engine (bearings timing chain cam followers valve grind) replaced the clutch and skimmed the flywheel.The bang in the carb I think was caused by over revving when the clutch went,with exhaust gas igniting the fuel/NOS in the inlet.So I replaced the dashpot damper,throttle disc and seals and she idles better than before I think.Now to get some miles in before I really test it.

'Where does the engine go?'

Good stuff :)

is this back fire disc simlar to a core plug? as in a lose press fit that will take say 50 psi before it falls out

good to hear you back going so fast

Pleased to hear that it was not more serious, Steve.

Thanks guys,let's hope it still does it's stuff.

'Where does the engine go?'

is it a stronger clutch steve ?

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

No Robert,but the last one survived 4 years of abuse.The problem is to find a Ford clutch that will fit on the Midget flywheel,most are too large in diameter. If I have to go stronger I think it would need to be a slipper type.

'Where does the engine go?'

cool. was it the centre of the plate that tore out ?

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

No,it shed the lining completely,which filled up the bell housing! Amazing volume of the stuff,it even jammed the starter bendix.The plate was left all bald and shiny,like me.

'Where does the engine go?'

So went back to Shakey on Sunday, got in 5 runs re-tuning the nut on the steering wheel and finished with a 12.4/110 pass which is only 0.1 off a PB.Last run I had an oil leak from the turbo feed banjo bolt coming loose.Very exciting when this got onto a rear tyre and I actually had to LIFT! Anyway easy fix and then I trundled home,very happy with the day

'Where does the engine go?'

nice one good to hear its all sorted

Done now needs redoing lol

nice...

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

excellent!

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

Haven't updated in a while.
Over the Winter I fitted a four bar set up with coilovers to the rear end. Went to Shakey last Monday and managed a new PB of 12.2/111 with a 1.76 60ft.
Need to put some stronger springs on the back,as it's rolling a lot between power on and power off. Also much adjustment to play with on the four bar, so much confusion and head scratching.

Edited by steve1275 on 27th May, 2015.

'Where does the engine go?'

12.2 good work :)

If something is worth doing, it's worth doing half of.

Thanks John it felt good

'Where does the engine go?'

Fitted some 50% stiffer rear springs and went back to Shakey last Sunday. Track was really good and ran 12.09/112 with 1.75 60ft. So feel I'm getting near my goal of a 5 port A series into the 11s and then driven home

'Where does the engine go?'

That's good going. That next tenth may be hard to find.