1900 Build

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Waylynn
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Joined: Fri Mar 20, 2015 1:29 pm
Car Make: Vw
Car Model: Mk2 Jetta CLI
Location: Johannesburg

1900 Build

Post by Waylynn » Wed Nov 29, 2017 9:27 am

Good Morning Guys.

I need some advise/guidance. I have started with my 1900 build I am 98% ready to start with the engineering ( Kempton Park Automotive Engineering).
The parts i have for this build thus far.

- 1800 forged crank
- AE 83.48mm piston (Pistons have 83.48mm marked on them)
- Conrods from a AFX 1600 engine
- Oil pump and intermediate shaft from the AFX 1600 engine
- 2lt Head with a G-CAM.

These parts will be used on a HV block that is ready for engineering.
I have measured the 81mm piston form the 1800 and its about 3mm longer than the 83.48mm piston so the block will have to be decked.

My questions are as follow:
How do i work out the CR for this build?
Must the block be bored to 83.5mm or 83.48mm dont want the piston to have a play?
Is there a need for the intermediate shaft to be grinned narrow to about 5mm or is that just for the 2lt short block conversation?
Will the 1600 oil pump supply enough oil to the head?
Where do i get a head gasket that will will work for this build, did some research apparently copper gaskets are the best?

All the labour will be done by myself, but i believe the engineering is the make or break for this build.

Thank you in advance for the assistance guys.

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panic-mechanic
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Re: 1900 Build

Post by panic-mechanic » Wed Nov 29, 2017 10:12 am

If you used the 2.3 piston then the block could have been decked less.
No need to grind IM shaft.. Only 2l crank mod
The 1600 pump will be fine but you should always install a new pump on a new build.
You buy the oversize 2l steel head gasket for a 2l motor. Just ask most places will know and GW really should have them.
Youndon't just work out CR. You have to measure volumes and from there calculate it. Search on the web on how to measure the volumes. You will need some stuff like a flat perspex plate and a pipette or a big hypodermic.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.

Waylynn
Enlisted
Posts: 7
Joined: Fri Mar 20, 2015 1:29 pm
Car Make: Vw
Car Model: Mk2 Jetta CLI
Location: Johannesburg

Re: 1900 Build

Post by Waylynn » Wed Nov 29, 2017 1:51 pm

Thanks for the reply/assistance Panic.

I will start searching the web on how to calculate the CR, I will chat with Steven as well to see if they don't perhaps do it when boring the block.
But if the piston sits flush with the block and the gasket is fitted should that not be fine?
I am assuming because there will be enough space between the valve and the piston when the valve if fully down and piston is at TDC.
because of the gasket spacing and the dishes/bowl like chambers on the head

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panic-mechanic
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Joined: Mon Jul 29, 2002 9:08 am
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Location: Benoni, putfontein.

Re: 1900 Build

Post by panic-mechanic » Wed Nov 29, 2017 8:11 pm

no they can't calculate the CR from just the block. You need the total volume of the pistons, chamber and gasket at tdc.
Squish pad must not stick out more than 0.8 mm to be safe but it still does not tell you CR as the head volume can be different.
Stephan van Tonder - Jhb - Putfontein Benoni
'07 Audi S6 V10 - beast !!!!!
'05 Audi A6 3.0L TDI Avant
'07 Audi A4 2l TDI
'95 Audi 90 coupe quattro
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.

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