Datsunboy's KP510 SSS Bluebird coupe

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z18et1200coupe
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby z18et1200coupe » Fri Apr 01, 2011 8:27 pm

i thought that stuffed valve stem seals didn't even make any smoke once the motor is running.. on start up a big puff of black smoke comes out the exhaust but after that no smoking is noticable. i know a few people that have built motors ad not run valve stem seals because of roller rockers or a bigger cam and there is no smoking once the motor is running.
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby classicdat » Fri Apr 01, 2011 8:55 pm

I'm guess you could get away with no valve stem seals on a new engine, I think my guides would have too much wear to be up to it. Leave an engine idling that has worn valve guides and seals then give it a bootfull of throttle and you'll get a good puff generally.
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby nick_m » Fri Apr 01, 2011 10:36 pm

Yeah definitely a new motor only kind of thing.
I've heard its quite common practice with race engines to leave the valve stem seals off on the exhaust valves as the extra lubrication keeps them cooler and stops them seizing in the valve guide
This was in reference to big yank v8's so bigger valve stems, more friction, more heat etc.

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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby Bartman » Sun Apr 03, 2011 7:36 am

Valve guide seals aren't as important on the exhaust valves, as they never see the vaccuum that the inlet does. When you snap the throttle shut, the intake goes into high vaccuum on account of the cylinder drawing against the closed throtle blades. So this high vaccuum will draw oil past the stem of the inlet valves, especially when there is some wear in the guide. People often dispense with the seals where double or tripple valve springs are used. L series motor use the superior style of seal which has a spring loaded ring that holds snug to the valve stem.
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby datsunboy » Mon Aug 15, 2011 6:47 pm

Well, I have been slowly rebuilding my L16 for the coupe.

I have some pics somewhere I think, that I will upload later.

But today, I decided to test the fuel injectors that came standard with the L18E, and also some brand new injectors that I have that im not 100% sure what they're from.

I came up with a genius plan......built it.....then started testing.
But unfortunately, it seems my test rig didnt seem to give the right results.

There was a great variance in fuel quantities delivered, even from the factory injectors.
This could be due to the battery not being 100%, or the fuel pressure changing (I had no vacuum connected to the FPR), or simply dirty injectors (a few of them wouldnt spray anything at all until they had a few taps with a screw driver).

So I will take them in to the shop to get cleaned and then tested properly at a constant pressure.

anyway.....pics of my awesome test rig (that failed to get correct results)
P8157131.JPG

P8157132.JPG
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby Bartman » Mon Aug 15, 2011 7:47 pm

It's not that expensive to have your injectors cleaned and flowed Dan. It's best to eliminate all the variables rather than try to get things running properly when there are variables that are all over the place.
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby datsunboy » Mon Aug 15, 2011 7:55 pm

yeah, as I said, I will be getting them cleaned and flow tested.

last time I think they were around the $10/injector mark for that? but that was years ago.

Does anyone else do them? only place I know is "diesel services" used to be on parkhouse road
1969 SSS Nissan Bluebird coupe
1970 Datsun 1600 - CA18DET - Sold!

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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby dirtyleppa » Mon Aug 15, 2011 9:26 pm

you are thinking of diesel pumps ltd dan, they are on parkhouse. diesel services are on nga mahi rd, near royce clive engineering
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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby datsunboy » Mon Aug 15, 2011 9:47 pm

ah right you are Dylan.
It was definately them.....will take them to Diesel pumps on parkhouse unless anyone knows anyone else?
1969 SSS Nissan Bluebird coupe
1970 Datsun 1600 - CA18DET - Sold!

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Re: Datsunboy's KP510 SSS Bluebird coupe

Postby Bartman » Mon Aug 15, 2011 9:48 pm

I think caraid do them too. (wont cost anything to ring them and ask)
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