DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

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DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Thu Oct 20, 2011 1:15 pm

So wats the difs I ask this because I was studying my heyns manule the outher night and saw that the valve sizes were the same on both now if i am thinking correctly the heads should be the same as the bore on 1.6 and 1.8 is the same
Ex: Jetta Mk2 CSI


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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby 6teen_valve » Thu Oct 20, 2011 3:06 pm

I have just done an head overhaul on what I thought to be a 1.8 mk2 head
To my surprize it was a 1.6 head, because aparently the 1.8 valves are longer thaan
The 1.6 valves. This is what I was shown by alert spares!
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Thu Oct 20, 2011 4:32 pm

will the to heads interchange
Ex: Jetta Mk2 CSI


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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby 6teen_valve » Thu Oct 20, 2011 5:00 pm

i dont see a problem, but maybe there is,

who else can advise on this subject.?
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Fri Oct 21, 2011 7:30 am

They should be identical.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby FM1 » Fri Oct 21, 2011 7:43 am

on the topic but slight off. are there then a difference between the 1.6 and 2.0 head, and will a 2.0 head fit on a 1.6 block
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby OEM+ » Fri Oct 21, 2011 7:51 am

MadMax101 wrote:So wats the difs I ask this because I was studying my heyns manule the outher night and saw that the valve sizes were the same on both now if i am thinking correctly the heads should be the same as the bore on 1.6 and 1.8 is the same



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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Fri Oct 21, 2011 8:08 am

2l head also interchangeable. The only head that is really differnt is the 1.3 and 1.4
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby Killerwatt » Fri Oct 21, 2011 8:14 am

just remember that you got solid lifter and hydro lifters in the mk2's, that's why the valve lenght differs. the kjet head had the big valves and the carb head had the smaller ones.

like panic said heads are interchangeable but if one is solid lifer and the other is hydro, the camshafts are not interchangeable.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby heineken » Fri Oct 21, 2011 8:54 am

Sorry for the Noob question....

With regards to camshafts for 1.6 & 1.8 carb heads, which one comes with an "A grind" and "G grind" cam

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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Fri Oct 21, 2011 9:06 am

G-grind was ONLY found on 1.8 GTi's
A grind only found on the longblock 2l engines. They were all injection as well.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Fri Oct 21, 2011 3:53 pm

I have a 1.6 head at home and a 1.4 head and i meshered the valve sizes and they the same. what is the valve sizes for the K jet head why would there be a differens
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby Schabzo08 » Fri Oct 21, 2011 6:01 pm

anyone here selling a G cam...? Mine got f**ked when my head seized.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Fri Oct 21, 2011 9:28 pm

Madmax191 take a picture of the 2 heads next to each other from the combustion chamber side and post it here.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Sat Oct 22, 2011 9:09 pm

Left is 1.6 right is 1.4

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1.4 comustion chamber
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1.6 comustion chamber
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1.4 front
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1.6 front
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Ex: Jetta Mk2 CSI


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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MhVW » Sun Oct 23, 2011 10:21 am

1.4 head:
Intake valve: 38mm
Exhaust valve: 33mm
Combustion chamber: 27cc
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Mon Oct 24, 2011 7:13 am

OK the main diffs between the 1.6,1.8,2l heads and the 1.4 head is the size of the combustion chamber and that is quite cleary visible on your picture. Usually the 1.4 that I have seen also has a smaller intake valve but I get a feeling that somebody modified the one you have to have the same size valves as the other heads. You can see where the chamber was cut away on the edge to accomodate that.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Mon Oct 24, 2011 3:20 pm

panic can the chamber be reshaped to fit for the use on a 1.8 motor or could i just leave it as is to push the compretion a bit
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Mon Oct 24, 2011 6:58 pm

it's not going to push it a 'bit' it will send it to around 13.5:1. But you HAVE to measure volumes and calculate the CR as every engine differs and what I calculated for one engine 8 years ago might not be true for what you are working on.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby RoadHaWg » Mon Oct 24, 2011 9:50 pm

For what it's worth....I have a 1.4 head on a 1.8 carb block. It's apparenlty been worked with a longer crank etc to be 2.1L

Seems to work...But I haven't tried any of the bigger heads so I don't know if I'm losing any power because of it.
Panic: Would you be able to tell if you had to use less timing when tuning it because of the comp ratio?
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby MadMax101 » Tue Oct 25, 2011 12:10 pm

road hawg what pistons you using there
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Tue Oct 25, 2011 1:13 pm

No can't really tell. you also have to calculate the CR to know for sure. I'm always amazed that guys will just slap a motor together without actually bothering to work out CR for real. There are many factors affecting ignition timing and CR is not the only thing. Some engines are more prone to detoantion than others.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby RoadHaWg » Wed Oct 26, 2011 3:39 pm

panic-mechanic wrote:No can't really tell. you also have to calculate the CR to know for sure. I'm always amazed that guys will just slap a motor together without actually bothering to work out CR for real. There are many factors affecting ignition timing and CR is not the only thing. Some engines are more prone to detoantion than others.



Ok just wondering.

Yeah, It did have a 2L head on it when Jerry had the motor, but he broke the cam bet and killed the head. Sarel rebuilt it with the 1.4 head and he reckoned the compression was actually lower now with the 1.4 head as the 2L head had been skimmed a lot. His words.

I just said "ok"


Apparently they are kombi pistons with the squish pads machined down/flatened or whatever. I have no idea what's Really in that motor. Sarel reckoned the crank was worth more than the rest of the motor combined.
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Re: DIFF BETWEEN MK2 1.6 HEAD AND 1.8 HEAD

Postby panic-mechanic » Thu Oct 27, 2011 7:43 am

Well if he calculated the CR then surely he should have told you what it was?. Yes honestly there is no way I can gues what it is without having actually meausred the values. The tuning cannot tell you but the fact that it ran quite nicely with realtively short timing does mean it was relatively high.
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