toffi vatanen

whats the best spark plugs to use in my 4x4 cosworth , its a harvey gibb engine , running a msd chip , t34 , and greys , roughly about 350bhp........

toffi vatanen

bump

St3V3_C

071's

Couple of quid each, and good for up to 600 horses

toffi vatanen

sorry to sound stupid, what make are 071s

rapidcossie

http://www.randbmotorsport.co.uk/shop/Parts.asp?ID=29

click this link and then phone up Mike tofy.

AVA usually also have BCR8ES's in stock

jemis

What plugs are in now.

St3V3_C

Ford.

Go there and get them at a couple of quid each

toffi vatanen

denso iridium power plugs,

toffi vatanen

cheers mate thanx for the info

jemis

Are they giving problems.

toffi vatanen

they must be f##ked coz , when the boost is coming in its blowing the spark out , just not sure how easy it is to get the denso ik27's,

JAP CRAP

As said. Just order some 071's from Mike R (randbmotorsport).

While we're on plugs; anyone know the correct gap for 071's on a 440bhp cossie. .75 isn't it?

jemis

I have the same problem running on champion's with a similar set up but only after doing a bit of motorway cruising, the plugs are fouling up and then I put the boot down it starts miising like a bastard over 20psi. After 10 minutes back on normal back roads its ok again.
I asked the same question a few weeks ago and most people said get the ford 071's which I have done aswell as buying a group A coil. As yet I havent tested them but have been told it should run ok now.

toffi vatanen

yeah it only happens sometimes, i have the group a coil fitted so i hope the 071's do the trick. i think the denso plugs were fitted by ma developements when it was mapped, so i'm not sure whether to put densos back in it,

jemis

I'm hoping the ford plugs solve it otherwise it will have to be a remap again.
It sounds like you have a similar set up in which case you should have more 400bhp rather than 350.

toffi vatanen

i think its about 360 or 370bhp to be honest, the turbo is a group a t34 but its got a small exhaust housing, i'll pick up a 63 housing for this season,

jemis

Nice one I have the .63 running 30 psi and its about 400hp & 385 lb/ft but it can eat gearboxes if your not careful

bunjeeman

If you are using Denso Iridium's, get the IK31 and not the IK27's which are a hotter running plug and can melt..... You can get the IK31 from Stu at MSD or on their ebay shop.

We have a lot of traffic here in Hong Kong and the other plugs tend to foul easily, but the Denso's don't and seem to perform well too.

MARCOSWORTH

iTrader: (24)

Yes you defo need IK31 or IK34 from Denso

R5FORD

iTrader: (1)

iv got denso ik31 and misfires like a mofo..

running 25psi aswel..

maybe i need to make the spark plug gap smaller.

KSA-Cossie

iTrader: (4)

Or go wasted spark.

toffi vatanen

i'm confused, this plug carry on is not fucking straight forward is it,

jemis

Stick with the ford 071's, they are £2 each from matt lewis with free postage on ebay, at that price there worth ago.

rapidcossie

I ran IK27's in my car and was under the impression they are a cold plug, not a hot one?

big_wig_074

champion c59c's

RST-AndyP

The denso's are not designed to be "regapped" so dont blame the plug when the tip falls off! 071's is all you need.

Twellsie

iTrader: (1)

i have ik27's in mine at the moment, but it seems to stutter when it hits the boost spike, kinda hesitates then carrys on, could this be down to the plugs? and is there any way of telling its the plugs, just from looking at them?

Twellsie

iTrader: (1)

by the way what is the difference between ik27's 31's and 34's

R5FORD

iTrader: (1)

stu recomends them being re gapped tho so i was just going by what i was told.

bunjeeman

They have different heat ranges, the ik27's are like the C59's and and ik31's more like the C57s' and I guess the ik34's are an even a colder plug.

Please feel to correct me if I'm wrong.

I had a slight miss fire with the ik27's when boost spiked, but not with the ik31's.

Twellsie

iTrader: (1)

so what is meant by it being " a cold plug"

bunjeeman

"a cold plug" means that it works within a higher temperature range, so more boost should use a "colder plug" i.e. ik27's or C59's for lower boost cars and ik31/C59's for higher boost.

At least this is how I understand it to be.

KSA-Cossie

iTrader: (4)

071's job done.