Track day - engine damage?

SG4247 · 11-05-2020, 02:17 PM

These plugs are defective! Lol..

Went to the track Sunday with my 2010 touring WHTRICE.

Made a few laps and the car runs like gangbusters, and then just lays down on the last 1/8 of the 1/4 mile. Fresh bottle, proper pressure, etc...

Spraying 100 hp shot with the NX GTR dual plate kit with E85. I logged all the runs and was watching the AFR close. Same tune up went 11.58 and 11.62 three weeks ago.

On the first run, I did just bump the rev limiter on the 1-2 shift, but didnt notice any change in the sound of the engine afterwards. Car went 12.08.

Plugs in order as they were removed from the engine.

The “good” plugs came from the front of the engine cyls #1 and #2 as if you were standing at the front of the car. They get worse as you move toward the rear of the car.

Motor would start and run surprisingly. Still had to get a roll back for the trip home.

Not sure what happened, but cyl #5 has no compression. I mean zero.
The other cylinders are all 230 or more. I have bore scoped #5 several times and dont see a problem with the piston top. I figure its either smoked the rings or blown a head gasket...not sure yet. But even if it had collapsed the ring land I would expect some compression right?

Bummer...may need a short block.

Spooler · 11-05-2020, 02:41 PM

Ouch, that would have to suck. You may have got a bad tank of E85. Hard to say what happened. Look for detonation issues if you pull it apart. Only way I know to prevent that is to run E85 out of a barrel to get consistency.
I have already been for warned on that with my new engine.

Rusty · 11-05-2020, 03:04 PM

OHhhhh.......... looks like you might have turned the top of the pistons into silly putty.

Lean burn.

SG4247 · 11-05-2020, 03:20 PM

Strange that the front plugs are okay, and the rear plugs are destroyed...

Makes me think that the plastic 370Z intake manifold does not distribute large amounts of E85 / Nitrous in a semi liquid state very well.... the plug condition symmetry left to right is uncanny, but significantly different different front to rear.

Thinking about making it one nozzle per cylinder going forward.

SG4247 · 11-06-2020, 11:34 AM

Anyone have a recommendation for a source for a built short block?

I am thinking bored block, pistons, rings and rods on a stock crank. Something mild but more durable than the factory stuff. No more than 500 whp. Dont need another rabbit hole.

I see IPP, RGZ, AAM and others, but really looking for a solid reference on a good source that actually does the work, not a reseller.

SG

Hotrodz · 11-06-2020, 12:03 PM

Quote:

Originally Posted by SG4247

Anyone have a recommendation for a source for a built short block?

I am thinking bored block, pistons rings and rods on a stock crank. Something mild but more durable than the factory stuff. No more than 500 whp. Dont need another rabbit hole.

I see IPP, RGZ, AAM and others, but really looking for a solid reference on a good source that actually does the work, not a reseller.

SG

SOHO Motorsports

Sent from my SM-G965U using Tapatalk

Elmo370z · 11-06-2020, 12:26 PM

Quote:

Originally Posted by SG4247

Anyone have a recommendation for a source for a built short block?

I am thinking bored block, pistons rings and rods on a stock crank. Something mild but more durable than the factory stuff. No more than 500 whp. Dont need another rabbit hole.

I see IPP, RGZ, AAM and others, but really looking for a solid reference on a good source that actually does the work, not a reseller.

SG

Do not go to rzg or aam.

11-05-2020, 02:41 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,798 Drives: 2013 Nismo 370z Rep Power: 2684392	Ouch, that would have to suck. You may have got a bad tank of E85. Hard to say what happened. Look for detonation issues if you pull it apart. Only way I know to prevent that is to run E85 out of a barrel to get consistency. I have already been for warned on that with my new engine. Last edited by Spooler; 11-05-2020 at 02:45 PM.

11-05-2020, 03:04 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,180 Drives: 2011 Nismo GM 6M Rep Power: 2684437	OHhhhh.......... looks like you might have turned the top of the pistons into silly putty. Lean burn. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

11-05-2020, 03:20 PM	#4 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 785 Drives: 2010 touring Rep Power: 7842	Strange that the front plugs are okay, and the rear plugs are destroyed... Makes me think that the plastic 370Z intake manifold does not distribute large amounts of E85 / Nitrous in a semi liquid state very well.... the plug condition symmetry left to right is uncanny, but significantly different different front to rear. Thinking about making it one nozzle per cylinder going forward. Rusty likes this. __________________ NA on E85 - 12.402 @ 112 mph 100 shot E85 - 11.589 @ 117 mph JWT C2 cams rev Base Circle & Titan Valves

11-06-2020, 11:34 AM	#5 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 785 Drives: 2010 touring Rep Power: 7842	Anyone have a recommendation for a source for a built short block? I am thinking bored block, pistons, rings and rods on a stock crank. Something mild but more durable than the factory stuff. No more than 500 whp. Dont need another rabbit hole. I see IPP, RGZ, AAM and others, but really looking for a solid reference on a good source that actually does the work, not a reseller. SG __________________ NA on E85 - 12.402 @ 112 mph 100 shot E85 - 11.589 @ 117 mph JWT C2 cams rev Base Circle & Titan Valves Last edited by SG4247; 11-06-2020 at 01:45 PM.

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