924Board.org

[Grenadiers]

After a few weeks of not thinking about cars, I decided to pull the plugs on the CGT car for inspection. Looks like 1-3 plugs (L to R) are ok, but number four, hmmmm, a bit squished!! I heard a loud bang when the car died, and white smoke was pouring out the back end. Not sure cause/effect, chicken or egg, or whatever. Assuming plug is smashed, the valves are certainly not healthy either. I reused the rod bolts, but bought ARP nuts for them. I torqued those to oem specs, but, maybe that wasn't enough? They aren't as beefy as the oem nuts.


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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[Fasteddie313]

Ouch!!
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80 Turbo - Slightly Modified

[Harm]

[Fifty50Plus]

^ She looks like she's taking a dump. Like Dave's engine.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

[Grenadiers]

Now that's funny! Reminds me of Patrick Swayze in 1991s Ghost. His acting 'ability' to me was reduced to thinking he had to take a 'crap' throughout the movie~!

Anyway, the engine does not turn over, so have to assume the worst. No biggy, have a Series II engine to rebuild. This one will be scavenged for parts.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[ThomasJoseph315]

Plugs looked glazed,.. are those the standard temp plugs?

[Paul]

Maybe a broken valve is jammed between the piston and head. Did you try turning it backwards?
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[ThomasJoseph315]

I wanna see pics of this...

[Grenadiers]

It doesn't turn either way Paul; not sure if I'll pull the engine at the moment for carnage photos.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[fiat22turbo]

[ThomasJoseph315]

This is beginning to sound like a engine detonation

/me thinks about running colder plugs,... calls E3

https://www.youtube.com/watch?v=rTRy_pVtE1g

[Grenadiers]

It's possible, however, I have quite a few track hours on that engine/plug combo platter. No 'specs' on the plugs either to indicate detonation. I removed more stuff off the engine yesterday, 75 degrees and all outside, so may get motivated in the next week and a half to remove it.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[ThomasJoseph315]

It's prolly just one of those things where this last race was the straw that broke the 924's back.

If you change your plugs heat index let me know how colder you go. I imagine you'd prolly go pretty cold cause of the turbo and your racing, at least I would. I am considering going one step colder in my engine for stock use being as it's a bbq out there in LA soon.

[9xx]

NGK B8EVX plugs are also very good for the 931 engine.
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Mikko

All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944

[jason c]

Dave, I would suggest tearing the engine down & finding the cause before you build the next engine so whatever the failure was can be prevented on the new engine. I would also suggest running the coldest plug that does the job. Are you looking at the plugs with the naked eye or with a spark plug scope?
The #4 was definitely physical damage, not heat.
Fyi, running "colder" plugs will not make your car run cooler.