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Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 05, 2019 08:33AM

Hey everyone,

I was driving my Spyder a few weeks ago and it was running great until it started to misfire, especially in the middle RPM ranges. 3rd and 4th gear under load would be the most noticeable (2,500-3,500 RPM). This is less than 500 miles after a spark plug/wire replacement. So I pulled the plugs and found some were fouled. Right side was the worst, with a lot of carbon buildup, and a few on the left side were bad but not as bad as the right. Since they're new-ish, I pulled them, sprayed them with carb cleaner, then used a tool to scrape off any carbon deposits. Now it runs great, but I really don't want to be under the hood every few hundred miles just to clean spark plugs.

I get it... it's an old engine. I did check other posts and some suggested that it might be idling in choke for too long but I usually start driving gently after 1-2 minutes of warmup, so this is unlikely. My mechanic said I was running a little rich so he adjusted it, which I suspect may have been the initial cause. Otherwise, the engine runs wonderfully and is just a blast to drive! what else can cause plugs to foul so quickly?

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: Phil Dally ()
Date: September 05, 2019 08:35AM

What plugs are you using?

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 05, 2019 08:36AM

They're the standard plugs from California Corvair. I usually order from Clarks but these were part of another order.

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: Phil Dally ()
Date: September 05, 2019 08:38AM

What brand and what is the part number on the plug.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 05, 2019 08:41AM

I'll have to check on that. Thanks!

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 05, 2019 08:46AM

These are the plugs in the kit:

[californiacorvairparts.com]

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: Phil Dally ()
Date: September 05, 2019 08:49AM

We need the exact numbers...turbo engine plugs are typically colder.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: joelsplace ()
Date: September 05, 2019 09:31AM

Colder plugs foul easier.
If you get it warmed up the plugs will clean themselves from too rich on startup.
If they don't they are too cold or you aren't getting the engine up to full operating temperature or you have an issue like to rich or burning a lot of oil. If you had to scrape stuff off at 500 miles you are burning oil. Too rich will just make them sooty black.
Phil's question is good because you might be able to go a little hotter and help the situation.
My Spyder burned quite a bit of oil when I first got it but it never fouled any plugs. How much oil have you used in the 500 miles? I think mine was using about a quart every 1000 miles.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 05, 2019 11:26AM

Thank you all! What plugs do you recommend so that they don't foul as quickly?

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: MattNall ()
Date: September 05, 2019 11:46AM

Jimbo!! We cannot recommend a plug until you tell us what is in there NOW....

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: irfgt ()
Date: September 06, 2019 06:20AM

My 65 turbo did this and a new coil fixed it.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: cnicol ()
Date: September 06, 2019 07:38AM

What also comes to mind in the (in)famous turbo accelerator pump diaphragm. If you're not aware, the pump diaphragm also operates the mixture needle. When the diaphragm leaks or fails, the mixture needle goes to "full rich" and leads to fouled plugs and sooty exhaust.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: jjohnsonjo ()
Date: September 06, 2019 07:40AM

You really can't adjust the carb except for idle without changing jets.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: RKF ()
Date: September 06, 2019 10:46AM

I agree with other on this thread. Identify the heat range of the plugs that are installed, as indicated by the number, then replace the plugs with a hotter plug.

Knoxville TN

1962 Corvair Rampside
1963 Corvair Spyder Convertible (project)
1966 Corvair Monza Convertible
1918 Overland Touring Car


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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: vairchet ()
Date: September 06, 2019 11:54AM

CorvairJimbo's link displays what appear to be Champion clones: Precision brand #P46H spark plugs. Not certain what heat range this number represents.

Chet in Ramona

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: mikeycee ()
Date: September 06, 2019 12:07PM

Chinese Champions anybody? Maybe the Frito Bandito. eye rolling smiley Mike



Edited 1 time(s). Last edit at 09/06/2019 12:09PM by mikeycee.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: JimBrandberg ()
Date: September 10, 2019 08:42AM

Do we know if the P46H is actually the plug he has?

If it is, do we know if it crosses over to AC 46? That is already hotter than usual for a turbo which I believe would be 44.

To answer the poster's latest question, if it was here I would start out with NGK B6HS gapped at .030 if it is stock points and condenser. It may not help since it could be a too rich fuel condition that is the real problem but it's a good base line. BR6HS is a little more expensive and a resistor plug to help with radio interference.

Precision spark plugs may be just fine, I'm just not familiar with them. I would not go any hotter than something comparable to AC 46 in a Corvair turbo engine. Conditions get severe if it's making any boost and too hot a plug has been associated with holes in pistons.

We haven't heard any feedback for 5 days, topics on this forum tend to fade away.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: CorvairJimbo ()
Date: September 10, 2019 08:56AM

Hello everyone,

I actually drove the car to work today so after work I'll pull one of the plugs and get that info for you. Sorry for the delays!

Thanks to all of you for your input.

1964 Corvair Spyder Convertible 150hp turbo.

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: corventure Dave ()
Date: September 10, 2019 09:03AM

Please, Be sure the engine is COLD when you go to remove the spark plugs.

Corventure Dave

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Re: Fouled plugs on 150 Turbo, less than 500 miles
Posted by: playerpage ()
Date: September 10, 2019 10:06AM

Never made aware of the hot plug issue. Good info, thanks everybody.

____________________________________________

Eric C. Player, Porterville, CA
Member: CORSA National, Central Coast CORSA, South Coast CORSA, and San Joaquin Valley Corvair Club
THEN: 1965 Monza 110 Canary Yellow
1967 Monza 140 Red
1966 500 110, Black; nicknamed "Shadow"
1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW: 1966 Corsa 180 Turbo; nicknamed "Bluvair"

"It would not have helped if I had [taken notes], as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

------

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