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Removing swirl chamber covers.
by
saurkraut
on 03 Mar, 2007 09:48
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Any body ever remove the swirl chamber covers from a new head? I have to remove them befor ceramic coating.
I tried tapping them out with a hammer and brass punch and it only move a little. i don't want to dork up a new head.
Would putting it a 150 F oven for an hour help?
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#1
by
935racer
on 03 Mar, 2007 18:40
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Heating up definately helps, I heat them to 200 degres farenheit, use a blunt object through the injector port and and a hammer to punch them out. Don't ceramic coat those chambers eithers, leave them in, I havent had good luck with CC'ing them.
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#2
by
saurkraut
on 04 Mar, 2007 06:24
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#3
by
tylernt
on 04 Mar, 2007 09:21
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Don't ceramic coat those chambers eithers, leave them in, I havent had good luck with CC'ing them.
I know that somebody saw no benefit to coating only the prechamber inserts, but I thought that coating the entire chamber would result in less heat loss to the coolant, and therefore easier cold starts and more efficiency. Is there a bad side to coating the prechambers?
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#4
by
RabbitJockey
on 04 Mar, 2007 09:42
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i kind of doubt it would help cold starting
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#5
by
tylernt
on 04 Mar, 2007 10:33
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i kind of doubt it would help cold starting
The theory is, it should keep more heat in the chamber as the piston nears TDC, instead of losing it into the aluminum walls of the chamber (aluminum is a good thermal conductor, which is why it is often used for computer CPU heat sinks and automotive radiators).
Not sure how dramatic the effect will be, though. If it's significant, I'm sure lots of folks would love to reduce the C/R of their TD's (so they can run more boost) without making it impossible to start in the winter. Us N/A guys would also love it if we never had to buy new glow plugs.
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#6
by
saurkraut
on 04 Mar, 2007 10:37
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The master plan is a ceramic coated 1.9 head on the 1.6 so hopfully I can run a slightly smaller radiator and get A big intercoller in front of it. I have an Isuzu NPR intercooler for the 1.6, but it won't clear the larger radiator. I have a new 1.9 head, just have to figure out what i'm going to run for valves, do some port clean up, and send it out for the cermic coating.
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#7
by
935racer
on 06 Mar, 2007 15:02
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Ceramic coating the pre cups is not a great idea, it keeps heat out of the actual prechamber which slows down the combustion process.
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#8
by
jtanguay
on 06 Mar, 2007 15:11
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Ceramic coating the pre cups is not a great idea, it keeps heat out of the actual prechamber which slows down the combustion process.
hmmm so what if you coated the prechamber??? why would ceramic coating the pre cups keep heat out of the actual prechamber?? very interesting!
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#9
by
935racer
on 06 Mar, 2007 16:57
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Don't ceramic coat anything in there, trust me I tried all sorts of variations, you need that heat. The only thing I would reccomend ceramic coating in that area would be the intake and exhaust valves, the exhaust ports (only if the particular coater is set up for doing so) and piston tops.
And really I think the only one thats worth the time or money is the piston tops.
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#10
by
tylernt
on 06 Mar, 2007 17:06
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Don't ceramic coat anything in there, trust me
Have you done the aluminum roof of the prechamber? That's what I want to try.
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#11
by
935racer
on 06 Mar, 2007 19:37
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Yep, no noticeable gains found. What are you hoping to accomplish?
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#12
by
tylernt
on 06 Mar, 2007 19:38
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Yep, no noticeable gains found. What are you hoping to accomplish?
I want easier cold starts and better MPG.
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#13
by
935racer
on 06 Mar, 2007 19:41
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I had the exact opposite results, the lack of heat kept in the combustion area meant a colder less complete combustion= poorer starting and less power per amount of fuel injected = less mpg.
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#14
by
tylernt
on 06 Mar, 2007 19:44
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Well crap. So much for that idea.
Sorry you messed up a head trying it, but at least the rest of us benefited.
