Hi all, just wanting some advice on the best engine mods for my Mk 3 8v. I'm thinking gasflowed head & schrick cam, or is it worth paying extra for a big valve head? Presumably I'd need a remap with a head/cam combo? What mods have you 8v guys done & what sort of performance increases are possible? Cheers, Robbo
For what it would cost to get the power out of the 8v you could easily swap the lump for a 16v. A 16v colour concept would be nice!!
Nah mate... been down the 16v route before, I much prefer the 'driveability' of the 8v. That's why I bought one . I'm not looking for ridiculous power (I'm selling a VR6 Corrado), just a bit of a pep for the 8v. I do most of the work myself, so I'm only really looking at the cost of parts. I reckon I could do the big valve head & cam for under a grand Cheers, Robbo
What about a mk2 digifant head? I believe they have bigger valves than the mk3 8v head and are a direct fit.
Not heard of that one before. It would certainly be a cheap 'big valve' head if it's a straight swap. Anybody else tried this?
Cheers Prof, could you elaborate a bit. Which head exactly, Mk 4 2L GTI? & would this be a straight swap? Robbo
Crossflow head is a nice idea, but can you still use the mk3 injection?? If not you are looking at Carbs or TBs which are both Big Bucks!!! Having been down the road of a flowed head using standard valves on a 2L id recommend going Big Valve. (Stage 2) Somewhere such as AmD Technik should be able to map it once all the physical mods are complete.. A Big Valve 8v head & mild cam (as you use Lambda control) such as a Schrick 268 with all the usual exhaust/filter/port matching/ 4 branch etc etc should gain you 20BHP.. Ive always been under the impression that mk2/mk3 8v digifant heads have the same valve sizes (40/33), but the mk2 item flows better, or is a better head to use.. The mk2 head is a straight swap for the mk3 AFAIK too.. Edited by: chrismc
Thanks Chris, always useful to get info from someone who's done the mods before. I'm deffo not thinking TBs at this stage, as you say... mega-bucks! I'm looking at spending around a grand, so probably best to go for a big valve head, cam & remap. I've already got the exhaust & filter. I'll certainly be looking at a mild cam, having experienced wilder cams in one of my previous Mk2s . The Schrick 268 sounds ideal having looked into them already for my VR. What have you done to yours to get 155 horses?! Cheers, Robbo
as far as i know you can still use the normal 8v injection on the crossflow, check with designadubsto be sure
I have already toyed with the x-flow idea, but was given the impression that it would require some kind of aftermarket management/fuelling... Robbo..my engine spec is as follows... Rebuilt & balanced mk3 AGG 2L bottom end Stage 2 (40/35) digi mk2 head Schrick 276 cam Lightened flywheel Re-profiled Throttle body Flowed/matched inlet manifold Supersprint 4-2-1 manifold & full system Invo stainless mesh cone filter AmD remap Porsche 3.5bar Fuel pressure Regulator... More or less as far as I can sensibly go for road use..
That's a nice spec Chris, especially in a Mk2, some serious money spent there! Pretty wild cam though. Are you running Digifant injection with the head? As you say best to stay within the realms of sensibility for road use Cheers, Robbo
I wonder if the mk3 engine would take the mk2 inlet manifold & TB?? The mk3 one looks painfully small in comparison. Edited by: 1990
Everything looks painfully small compared to my VR ... seems to go well enough though... now I remember why I kept my old Mk2 8v for so long Cheers, Robbo
