GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Sam on 13 December 2011, 14:27
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I need to maintain a compression ratio of 8:1 and obviously not twit the piston crown on the valves. Would the ABF head still run on a k-jet system? If not I assume I would be better off changin to full abf megasquirt on the hydraulic clutch and corrado gearbox which aint happening.
Cheers in advance
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why not cable clutch and mk3 golf gearbox ?
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why not cable clutch and mk3 golf gearbox ?
Because if I were going whole hog I would change to hydro. Anyhow, back to the question in hand :smiley:
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i assume its opposite to this mate
http://www.golfgtiforum.co.uk/index.php?topic=143694.0
just use kr head gasket and timing belt ?
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The problem with that is that it doesnt help with cr. I need to know what the std cr is when running a std KR block with an ABF head.
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The problem with that is that it doesnt help with cr. I need to know what the std cr is when running a std KR block with an ABF head.
ok sorry mate only trying to help :smiley:
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The problem with that is that it doesnt help with cr. I need to know what the std cr is when running a std KR block with an ABF head.
ok sorry mate only trying to help :smiley:
No worries boss. Ideally I need somone who has done it. Apparently the ABF head has a smaller indent or whatever its called to the valves, so it gives a higher compression. But people have said that the higher compression is minimal, 0.5:1 or even 0.3:1. But then you have the choice between 1mm gaskets and 1.2 mm gaskets meaning that the increase in compression is lost. But then does a KR piston hit a ABF valve?
There is info here which is helpfull in general
http://www.not2fast.com/vw/stuff/vw_engines.shtml
but no ABF specs, but I have just seen that I may be able to change my rods for g60s but the piston dish is then different and pin is different.
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Whats wrong with just using a KR head? Its not like KR's cost a fortune nowadays. Club Gti suggests the head volumes are very simiar but of a different shape, check it out.
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I am checking it out...
http://www.clubgti.com/forum/archive/index.php?t-146656.html
:laugh: try get any info from that, its a thread of people contradicting each other
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Fair point :grin:. Unusual for RJ to be so confused lol. If you have both heads its easy to check these things of course...... What is wrong with using a KR head anyway?
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you need a CR of 8:1 right, well std KR pistons gasket and head are going to give you 10:1
also are you on about early or late KR heads
the ABF head ain't much diffrent form a late KR head, ports better valve guides shorter, more clearance for cams but thats about it.
G60 pistons in a 16v would give you a CR 0f 0.f**k all :1
1) 16v pistons are domed, std 8v pistons are dished and give 8:1 when used with a 16v head g60 pistons are inverted buckets and give 8:1 with an 8v head and youd have to notch them to clear the intake valves anyway
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you need a CR of 8:1 right, well std KR pistons gasket and head are going to give you 10:1
also are you on about early or late KR heads
the ABF head ain't much diffrent form a late KR head, ports better valve guides shorter, more clearance for cams but thats about it.
G60 pistons in a 16v would give you a CR 0f 0.f**k all :1
1) 16v pistons are domed, std 8v pistons are dished and give 8:1 when used with a 16v head g60 pistons are inverted buckets and give 8:1 with an 8v head and youd have to notch them to clear the intake valves anyway
At the moment I run bushed standard kr piston rods and standard everything else so have a cr of 8:1 to suit the turbo thus.. i need to maintain this CR.
I'm merely asking about running an ABF head on a KR block, I'm not after any advantage or anything like that. Just if one came up cheap would my CR stay the same or merely differ to something like 8.5:1? I'm not sure which KR head I'm running, my car is an 89 if that helps?
I wasn't asking about running G60 pistons, just chasing figures around the page that I linked as an example. So could I use standard 16v rods and 8v pistons to achieve the 8:1? Not that that's really relevant to what I'm asking, just interested.
Original question revised, what is the compretion ratio of a ABF head on a KR block and will it work?
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http://www.ebay.co.uk/itm/VW-CORRADO-16V-KR-CYLINDER-HEAD-RECONDITIONED-GOLF-GTI-/220754944148?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3366052094
Looks good to me....
Anyone know if it fits on the Golf? If so its a bargain Sam and the works already been done....
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http://www.ebay.co.uk/itm/VW-Golf-Scirocco-Jetta-Corrado-MK2-1-8-16v-KR-GTi-Engine-Head-65K-027103373E-/160699260042?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item256a6c1c8a
http://www.ebay.co.uk/itm/VW-GOLF-MK1-MK2-MK3-1-8-16V-KR-RARE-BIG-PORT-HEAD-PERFORMANCE-/280790689652?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item41606de774
This one might be good too...
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Complete Engine for £200
http://www.ebay.co.uk/itm/KR-ENGINE-VW-GOLF-MK2-CORRADO-1-8-16V-KR-ENGINE-HEAD-BLOCK-/220882311849?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item336d9c9aa9
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CR of ABF head on KR block will be near as dammit the same as KR head on KR block
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CR of ABF head on KR block will be near as dammit the same as KR head on KR block
And the fitting is the same? i know the ABF has a slightly higher deg cam setup on it but also has a bigger valve interference (if im reading this right) especially on the intake ala..
2L 16V ABF cam specs:
Intake - 219deg @ 1mm, 10.8mm max
Exhaust - 220 deg @ 1mm, 10.8mm max
1.8L 16V KR cam specs:
Intake - 218deg @ 1mm, 9.6mm max
Exhaust - 226 deg @1mm, 10.2mm max
And the pistons in my block have a valve clearance indent on the front ala..
(http://i660.photobucket.com/albums/uu324/caistor_bmx/piston1.jpg)
rather than a flat crown. Stop me if I'm heading in the wrong direction here but I don't want it to smash the valves in when I first try starting her.
ps. ignore the shape of that piston haha
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to lower the compression you pistons will have been bushed down. so more clearance
also all 16v pistons have clearanceing for the intake valves
you can put kr cams in an abf head if you wish
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to lower the compression you pistons will have been bushed down. so more clearance
also all 16v pistons have clearanceing for the intake valves
you can put kr cams in an abf head if you wish
I would stick with the ABF cam as it offers a little more. I cant remeber off hand how large the bushings are on the con rods. So the ABF head fully lines up? Just a straight swap :smiley: