Gordini Turbo head on GT Turbo engine?

[avdakker]

Hello Guys,

last year i've been busy with converting a 70bhp B14 engine (Volvo's version of the C1J) into the turbocharged GTT engine using all the nescasary parts off the GTT engine (incl new pistons/rods/regrind crank/refurbed cylinder head and so on)

it now makes 150bhp at the dyno so i'm quite pleased with the result


however, i'm now looking for some big power and it didn't take long till i realised that a Gordini Turbo head was the way to go. i've sourced a non running Gordini engine (bearings and crank are a f*cking mess...) and was wondering if this head can be placed on the GTT engine and what mod's are required

i will create a custom multipoint injection system with MegaSquirt management (36-1 triggerwheel) along with custom manifold, custom exhaust manifold and Garrett GT2560R ballbearing turbo, i'm just worried about the engine block itself

- what cam do i need, will the GTT's cam work?
- can i use the GTT's pistons and rods? i've seen that the pistons are slightly different but don't know what will happen with the CR if i use the GTT pistons/rods with the Gordini head. since i'm running brandnew pistons and rods (just drove 2000km with it!!) it would be a shame if these can't be used..
- the Gordini block uses a hydraulic tensioner and dual distributor chain, can that be swapped over to the GTT block (wich uses springloaded tensioner and single distributor chain)?
- since the water pump is placed on the other side, are there any tricks for converting it to the other side of the engine?

are there any other problems that i might forget at the moment?

thanks in advance and regards from the Netherlands

 

[sparkie]

before you start spending loads of money converting the gtt block to the gordini hybrid block, you should know that the gtt engine will make 230bhp with some mods, that will come to less cost than fitting a gordini head. - the other point you will have to think about. - have you fitted a 180mm clutch plate to fit your volvo 'gearbox' or have you fitted a 200mm gt turbo one? - if so, i thought the volvo gearbox would break if you put too much through it.

however. - if you did use the gordini head with the gtt you will need the gordini cam (as the inlet and outlet valves are in a different order to a gtt), followers and pushrods. the other point is that you will need to chop the end off the gordini cam and also fit a bearing inside the end of the cam journal. The chain tensioner on the gtt should also be a hydraulic one - it was only campus's that had the sprung lever type.

gtt pistons will lower the compression ratio - ideal for bigger boost.

water pump is also a big problem - some people use a spacer and chop some out of the head to fit the gtt pump. - others use an electric pump.

much easier to sort the gtt engine you have in there already?

 

[avdakker]

it would be much easier going 200bhp+ with the gtt engine, but in the volvo there's literally loadssss of space as you can see, so why would i throw all the crap at the right side of the engine bay (would be easy to change the plugs though :lol: ) i've got a certain look in my head of what the finished engine bay would look like with a turboed crossflow head and to me that is more important than a bit more or less work + the gordini head has bigger valves and a much better combustion chamber design; it should be easyer to get more power when converted than with the GTT material hence a bit more reliabilaty. the setup in this car just asks for it imo.. at the righthand the turbo, brought to life via a stainless tubular manifold; feeding the compressed air right up front to the FMIC, and at the lefthandside out of the intercooler, into a short piece of plumbing to the butterflyvalve and into the intake manifold; fuel injected right before the cylinder heads intakes and into the engine; suck squeeze bang blow; there you have it :mrgreen:

i've got a few ideas for the waterpump issue allready and my welding/fabricating skills aren't too bad if i may say so so it shouldn't be too much of a problem

so basically, baseblock of the GTT + cam, followers, pushrods and cyl head should do it. that's good news, much less than i thought. lower CR is a bonus indeed!
chopping the cam, that sounds straight forward but fit a bearing inside the end of the cam journal? i thought that after i'd chopped it it would slide in the same as the original cam?

it has the original B14's pressureplate and 14kg heavy flywheel also a 185mm sachs paddleclutch plate the stock plate couldn't cope with the power, the 340's have a transaxle setup. with the MegaSquirt's triggerwheel setup i would be able to use a lightened GTT flywheel (only a spacer for the starter motor required), GTT reinforced pressureplate and again the 340's 185mm paddleclutch plate, transmission can cope with about 250/300nm but an upgrade isn't too much of a problem. the diff was a problem, now that i've welded it it manages to hold for now

 

[sparkie]

yeah i know the differences between the heads. the gt turbo runs about 140bhp with 15psi on a standard engine. the turbo 2 runs 185bhp at 15psi.
it maybe easire for you to use the gordini block, use the gtt crank and pistons in it. - direct fit. the gordini block has the bearing pressed into the cam journal - all you need to do, is knock the metal cap out of the end of the cam journal - take the cam out of the gtt block and use a long bar from inside the engine to tap it out. - then remove the seal from the gearbox end of the gordini block - then use the cap from the gtt block to seal it. - if you use the gtt sump - remember to use the gtt oil pump as the pick up is different to the gordini one.
you may need the volvo 480 turbo 200mm flywheel, as it uses different teeth numbers to the gtt one. - you'd also be advised to use the valeo volvo 480 turbo pre 91 200mm clutch cover - part of the 801015 3 piece kit. good for 230bhp in a gtt.

 

[phildini]

yeah i know the differences between the heads.................................

Sparkie you are the "CUSTOM MY RIDE" king! But I agree with you, just use a complete Dini engine. Also are you sure you have a turbo engine and not an atmo?

Also a Gordini engine will look lovely in your engine bay :wink:

Hey Sparkie, when can I come and collect my seats? :lol:

 

[sparkie]

:?: :lol: