GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Chantuz on 01 April 2009, 21:31
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Has anyone put their 1.8 8v gti lump on bike carbs??
I know you have to make your own manifold for it but what i would like to know is which bike carbs do you use?
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It's a dumb-f*ck idea as you're putting the carbs above the exhaust manifold, so you're very likely to run into lots of running problems as the fuel in them is likely to heat up, so you'll get vapour-lock etc etc.
If you want to keep it 8V, stick an ABA or similar head on there, so the carbs are round the front.
If you find 'some bike carbs' off something like a 1000cc bike and then get the inlet made by Bogg Bros then they'll jet them to suit, allegedly.
Personally I'd go with bike throttlebodies, run on proper management, so the motor (with the crossflow head) will behave itself. All your 8V stuff (cam, exhaust manifold etc) will bolt right up to the crossflow, but you'll need the waterhousing on the end of the head and the pipework to take the water to the radiator - there's not a water outlet on the front of the head, only the one on the end of it.
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If you find 'some bike carbs' off something like a 1000cc bike and then get the inlet made by Bogg Bros then they'll jet them to suit, allegedly.
not allegedly !!!!! they will !!!!
(http://i124.photobucket.com/albums/p18/rsturbophil/my%20cars/10102008404.jpg)
that did 172 on a dyno (not bogg bros) with a STANDARD 2.0 engine just a 4 branch and R1 carbs on it !!!!
Thay are an awsome set up and i would do it again (just not with the exhaust under them !!!
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It's allegedly for me cos I've not had any experience with them. :tongue:
Throttlebodies are the way forward - carbs are just a good way of hosing fuel quicker....
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It's allegedly for me cos I've not had any experience with them. :tongue:
:grin: :grin: :tongue: :tongue:
Throttlebodies are the way forward - carbs are just a good way of hosing fuel quicker....
i could get about 150 miles out of 47Ltrs of 98Ron fuel if i was gentle
but that was boring !!!! so i used to get about 100 miles per tank LOL
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i got a 8v soon be running on bike carbs , i know someone who ran their bike carbs right above the manifold and didnt get any problems ,
What head is the ABA or something you said about another head coz i can agree with you on that one as on a 8v the carbs are hidden away out of reach of air where as at the front like a 16v the ram air from the front would be amazing ,
What car in the head you are talking about from ?
Joe
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i got a 8v soon be running on bike carbs , i know someone who ran their bike carbs right above the manifold and didnt get any problems ,
What head is the ABA or something you said about another head coz i can agree with you on that one as on a 8v the carbs are hidden away out of reach of air where as at the front like a 16v the ram air from the front would be amazing ,
What car in the head you are talking about from ?
Joe
ABA head is the head from the mk4 gti i think.
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I'm toying with the idea of bike TB's on my 2.0 16v at some point in the future.
Nick
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if the ABA is from a mk4 are you telling me that can be put onto a 1800 8v mk2 bottom end then run bike carbs off the head as the inlet is away from the exhaust
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All these damned people posting on here when I'm prepping a response.... tsk.
Yes, the crossflow head WILL go "straight" on a 1.8 motor, provided you reposition the oil return on the head.
Dave at www.Futbus.com can make stub manifolds to accept throttlebodies and carbs. Nick, he's already got an ABF head as a template and is working something cute up for DannyP.
Here's the stubs he made for the MG I'm working on:
(http://diamondhell.com/images/rsgallery/original/IMG_3151.jpg)
OK, here's a couple of shots of my head:
When collected:
(http://diamondhell.com/images/rsgallery/display/P1210029.jpg.jpg)
Try and get yours off a car, with all the stuff you'll need still attached, or like me, you'll wind up spending a fortune at VW, picking up bits.
After cleaning, porting and re-positioning of the oil return:
(http://diamondhell.com/images/rsgallery/display/P2160033.jpg.jpg)
End of the head - these two are the only water outlets on the head - there is nothing on the front
(http://diamondhell.com/images/rsgallery/display/P1210030.jpg.jpg)
Here is the re-positioned oil return, after work:
(http://diamondhell.com/images/rsgallery/display/P2160037.jpg.jpg)
This motor can be found in most 1.6 or 2.0 petrol motors from the last 10 years - Golf, Bora, Passat, also Octavias and various Seats.
There are a bundle of photos of various installs of the crossflow motor on my site here (http://diamondhell.com/index.php?option=com_rsgallery2&Itemid=29&gid=27).
There's also a thread showing a manifold and carbs just here (http://forums.vwvortex.com/zerothread?id=4307309)
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sorry if i seem stupid , so that head shown there i can put onto my 1800 8v , what happends to the alternator as that mounts onto teh top left of the mk2 head and also what happeneds with the 8v gti exhaust manifold and down pipe does that fit ?
Cheers Joe
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Exhaust and manifold fit.
Not 100% about the alternator, as mine's on a 2.0 2E block.
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oh right i doubt it would work then otherwise would of seen more people have a cross over head on a 8v that must be why alot just mount them above the exhaust manifold and use some pipes to get ram air to the carbs ,
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Looking at photos of my car when it had the counterflow head on it, I think the alternator set up from the 1.8 would work - the adjuster bar bolts up to the bolt-on lifting eye. Even if it doesn't work immediately it wouldn't be hard to fabricate an adjuster. It's not rocket science.
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seen std alt used with webbers on crossflow so will work with bike carbs.
as for mounting the carbs above the exhaust you can tell you used to work for tsr.
it's a bloody nasty horrrible botch, the carb throats are very close to the firewall, there isn't room to get a good manifold in there the carbs and a pipe, you choudl dent the bulkhead but then if you drive it hard theer is a massive radiant heat issue when you slow down
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hmmm well sounds something i mite still do i got the carbs ready just need to run the 8v in , rather than soruce the head and solve the problem with alternator i think i mite have to bring my VR6 swap in a bit earlyer
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there are two option for doing it, nether i like. get teh carbs out from behing the engine, with a manifold with long runners comeing up and round,
or install them behing the engine just make sure you have plenty of heat sheilding
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i think try the heat shield idea i was thinking that but didnt want to say incase you thought i mite be some botch job animal , then if that fails get another head so they can mount at the front near the grill ,