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Skinners Sprint Micra

h701micra said:
I'm sure you'll be fine. A stage rally is no different to a long bumpy sprint.
Tarmac rallies are no different to autocross etc etc
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That's it mate the longest stage they have over here is 10-15 mins you sugars not going to drop in that space of time!

Hope alls well with the new arrival mate
 
Skinner_87 said:
That's it mate the longest stage they have over here is 10-15 mins you sugars not going to drop in that space of time!

Hope alls well with the new arrival mate
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They'll say about physical exertion and all that jazz that they do when you question it. But like everything it'll cost to get round it all

All is well thanks mate :)
 
Skinner_87 said:
I've just been for a blast up the mountain with the TPS unplugged and got the same lean AFR's to rule out the sensor having an impact. It must be the larger volume of air now the throttles working properly :(

Il stick the bigger jets back in the the morning and compare the TPS under load and unplugged to make sure it pulls the timing back to about 20 deg I think
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here,s my t/p/s and spark timing paul :)



you can see that its held @ 48 deg btdc at low load/cruise, then is pulled back to 20 ish @ higher load, then drops to 5 deg on lift
 
frank said:
here,s my t/p/s and spark timing paul :)



you can see that its held @ 48 deg btdc at low load/cruise, then is pulled back to 20 ish @ higher load, then drops to 5 deg on lift
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Thanks for that frank I think my problems now the speed delete mod needs doing :)

How's the 1.0 tubby going?

Now I'l have a spare shot block and two heads a summer turbo project maybe?
 
Steelies are back on with the yoko's in storage for winter.

Starting to strip the engine out tomorrow & get the jobs list done. Only and A4 page so far :)

Can anyone recommend a good flocking company?
 
Skinner_87 said:
:)

How's the 1.0 tubby going?

Now I'l have a spare shot block and two heads a summer turbo project maybe?
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its a hoot to drive paul ta, highly recommended as a project ;)
this one drives much like the TD05/CGA3 did, where the boost needle rises with the tacho needle, perfect for a track-tool, but somewhat laggy for a daily tbh
 
frank said:
its a hoot to drive paul ta, highly recommended as a project ;)
this one drives much like the TD05/CGA3 did, where the boost needle rises with the tacho needle, perfect for a track-tool, but somewhat laggy for a daily tbh
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Sounds like you need to add a smaller turbo to the one you're using to give some low down boost :)
 
Productive even with a bit of a hangover today :)

Cylinderhead removed, still looking clean after a few thousand miles, head gasket was like new! Now to clean it up ready to start building the CGA up



 
Also measured the head thickness and found its the full 121mm so there's room to raise the compression further (once my brain starts working and I can calculate it!)
 
Enuo said:
From what I've seen, with a thin smear of vaseline to help seal perspex. Also gotta measure volume left in block with piston at tdc and add that to the head volume
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Cheers bud, I think iv seen that info on here for a CGA alread some where ,though il need to take into account the 10tho that's come off the block already and the head gasket as well I imagine.
 
Skinner_87 said:
Cheers bud, I think iv seen that info on here for a CGA alread some where ,though il need to take into account the 10tho that's come off the block already and the head gasket as well I imagine.
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Best just measure it all again (twice) to make sure eh :) Doesn't take long I'd imagine, and it's another skill you can say you have you can apply to something a bit more exotic maybe at a later date :)
 
After a few hours chambers are finally clean. It will have a good going over with a straight edge but I might get a few tho taken of just to make sure it's dead level

 
Had a go at measuring the chamber volume tonight, bunged the spark plug up, a smear of grease around the outer edge and a dead flat plastic square with a hole to accept the syringe. 3 measurements brings me to an average of 21.3cc :) now to work out the bore volume!

 
clear perspex will show if you have any bubbles eh paul, there are some pics of mine on my cisco blog (bandwidth problem there atm)
i think i got the stock chamber to 24cc ? and 5cc head gasket ?
 
frank said:
clear perspex will show if you have any bubbles eh paul, there are some pics of mine on my cisco blog (bandwidth problem there atm)
i think i got the stock chamber to 24cc ? and 5cc head gasket ?
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Il have a dig around the shed Frank in sure there's an off cut from my binnacle, that makes sense added as much as I could before fitting the plastic on but a larger syringe would make it more accurate I'm sure :) rather than refilling this over and over
 
i think my stock was chamber = 24cc
head gasket = 5cc (pi x r squared x 1.2mm gasket)
and CG13 piston dish 7cc, CGA3 dish 9cc
 
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my 2mm skimmed/weldfilled chambers were 18cc paul :)
so a 1275 has a volume of 355cc at BDC and that is squeezed down to 36cc at TDC = 9.5:1 :)

74691.jpg
 
frank said:
my 2mm skimmed/weldfilled chambers were 18cc paul :)
so a 1275 has a volume of 355cc at BDC and that is squeezed down to 36cc at TDC = 9.5:1 :)
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Spot on Frank thanks! I think il use oil this time as well instead of water. All i need now is the stroke on the crank and im sorted for my comp ratio calcs :cool:

Aiming for around 10:1 i think depends how much slack its going to add to the chain.

Looking at the chambers it looks though metals been taken from around the exhaust ports as my valves sit proud where as yours are sitting below. Must have been part of the head work it had

 
yours looks like its been matched to the fire-rings and polished to me paul, so that will have dropped it half a point or more, i would go for 1.5mm personally :)
 
frank said:
yours looks like its been matched to the fire-rings and polished to me paul, so that will have dropped it half a point or more, i would go for 1.5mm personally :)
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Cheers Frank il allow a bit for the deck skim of 10thou, would there be much chain slack with that much of a skim?
 
After many hows with a dremel & a lot of degrease the pistons are ready to go into the new block.

Sump has been tidied up & made ready for a coat of tough black.




Playing about with rough calcs until the short block is made up, a 40thou overall drop gives me a 10.7:1 Comp
 

Attachments

  • comp ratio.pdf
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A little bit of progress to report :) pistons and rings all in, shells and bearings torqued and angles up.

Oil pump stripped clean and re assembled ready to go. Hopefully all together with the head on ready for timing over the next week.





 
All engine ancillaries fitted.

Fresh centre support painted up.

Rear gearbox mount packed with solid exhaust rubbers and urethane sealer.

All removed bolts have been oiled and passed through a dye.

Engine bay freshened up tomorrow & re routing the fuel filter & pressure regs.
 

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