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  #31  
Old 07-07-2015, 11:37 AM
SKiddell SKiddell is offline
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Originally Posted by Rob Gaskin View Post
Yes - Sean often can't see things e.g. ebay items.
Or common sense
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  #32  
Old 07-07-2015, 11:52 AM
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SeanDezart SeanDezart is offline
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Originally Posted by Rob Gaskin View Post
Yes - Sean often can't see things e.g. ebay items.
Ok from last night - it suddenly appeared and I was looking via two different PCs with different software and internet access'.
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  #33  
Old 07-07-2015, 12:11 PM
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Or common sense
Had enough to rejoin and support the club here......
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  #34  
Old 31-05-2016, 03:45 PM
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I haven't posted on my engine for a long time, so due an update:

- Pinnacle of last year for the new engine was a 13.59 at Santa Pod
- Over the last winter, I've been getting a new head together - it's a P90 with porting & modified combustion chamber and a big cam.
- I also rebuilt an FS5W71C gearbox with a quickshift that I fitted over the Winter.

A couple of random photos - first the ports. I had the waterways tapped on 5 & 6 so I can later improve the cooling flow from the back end of the head.

p90-head-ports.jpeg

And I also added a Kameari crank damper, 'cos it's going to rev a LOT more with this head
p90-damper.jpeg

I put it together a couple of weeks ago. I hadn't got too far with (the carb equivalent of) mapping it before the diff died - hence my classified for a new R200 diff.
Over this weekend, I prepared the new diff, got the propshaft balanced by Bailey Morris and fitted it all.
I went for a test drive on Saturday and the vibration and noises from the diff & prop are all gone. I ran it up to 8000 a couple of times too which went well

Just as I got home, the rad sprang a like and it was misfiring a bit. The electric fan had worn a hole in the rad - so I've soldered that up and gone back to the viscous fan for now.

I pulled the spark plugs and they were not looking their best:
burned-plugs.jpeg

Some of the tips have melted so that's where the weekend fun stopped.

I hope there's no serious damage - I've ordered some colder plugs. I'll retard the ignition timing a few degrees next weekend and see how it is, and build back up the revs, checking the plugs regularly.

Next up? stop melting plugs, get the fuelling right, go to Le Mans Classic, get a new exhaust manifold from Sean, get the fuelling right again, go to Northampton Motorsport for some time on the rolling road to optimise and see what it produces (and maybe Santa Pod along the way too).

I should also thank pmac & skiddell for their help. If it works well, it's down to them (and Phil who built it). if it doesn't work well, it'll be down to me :-)
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  #35  
Old 01-06-2016, 02:01 PM
racer racer is offline
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Strange the plugs have gone like that John? The colour looks about right.

I was running eights in mine at 34 degrees total adavance. Gone back to sixes now and all is well with the same timing, and much better cold starting. I might end up with 7's when these are worn.

What timing were you running??

Did you weld up the P90 to compensate for the larger chamber?
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  #36  
Old 01-06-2016, 03:00 PM
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You can't see the insulators in the pic, but they are bone white which is odd - the mixture was rich if anything, going by my AFR gauge.
It was set at 35 degrees total, I've gone to about 32 degrees now but I might well go lower until I get on the RR- I've been reading a bit about chamber shape and advance, and the optimal advance may well be less than 35 for this head. I guess I'll only really know when I get on the RR.
Plugs were B7ES - I've got some BCR8ES coming today I hope.

Yes, had a fair bit of welding on the chambers to reshape and reduce the size. It's down to 39cc (so far from radical, CR in low 11s).
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  #37  
Old 01-06-2016, 03:18 PM
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Strange that the insulators were white then. Perhaps a false reading from your Afr ?

Should be a good squish from the P90, lets hope it's just leaness causing the detonation?

I'm at 12.5 to 1 on flat tops with no Det, running quite rich on the SU's.
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  #38  
Old 01-06-2016, 03:34 PM
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jonbills jonbills is offline
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yeah, I think my squish is excellent - a lot of squish area with the welding and just over 0.5mm clearance between head and piston.

Could be the AFR setup, it's strange since the plugs looked as you'd expect for 'slightly rich' until I started revving it past 7k.

Time will tell.
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  #39  
Old 01-06-2016, 03:48 PM
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SeanDezart SeanDezart is offline
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Originally Posted by jonbills View Post
.... until I started revving it past 7k.

Time will tell.
And time will tell on your engine too at +7k.
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  #40  
Old 01-06-2016, 04:06 PM
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jonbills jonbills is offline
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Indeed. It was built to handle it, so I do intend to use it.
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  #41  
Old 01-06-2016, 04:12 PM
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SeanDezart SeanDezart is offline
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U der man !
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A new Datsun era !

Sean Dézart
(33) 6 14 95 42 17
seanz@wanadoo.fr

https://www.facebook.com/pages/Zstor...6789934?ref=hl

Club Datsun-France www.datsun-france.com

I Love Zs.
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  #42  
Old 02-06-2016, 08:31 AM
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richiep richiep is offline
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Quote:
Originally Posted by jonbills View Post

Yes, had a fair bit of welding on the chambers to reshape and reduce the size. It's down to 39cc (so far from radical, CR in low 11s).
Where did you get the head welding and porting done if you don't mind me asking?
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  #43  
Old 02-06-2016, 10:09 AM
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jonbills jonbills is offline
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I don't actually know! I know those jobs were farmed out to different peeps that specialise in them. My friend Phil managed it and did most of the rest of the work. He does a lot of race engines.
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  #44  
Old 02-06-2016, 10:34 AM
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Rob Gaskin Rob Gaskin is offline
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Jon, what is the plan for the cooling of 5 and 6.
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  #45  
Old 02-06-2016, 10:41 AM
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jonbills jonbills is offline
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Jon, what is the plan for the cooling of 5 and 6.
Not really decided on that yet - either I'll run a line from the taps to the thermostat housing or to the return line from the heater to the water pump inlet.
The first keeps all the cooling under control of the thermostat, but the latter has better flow out of 5 & 6. Or a hybrid of both. There's a mega thread on this topic on hybridz.org.

The deciding factor will probably be the fittings I find to do the plumping
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