performance cam, worth it?

hi all,

thinkin of doing a couple of mods to the 1.8 gti, was wondering whether getting a new schrick cam would make much difference, or should i just keep it original?

thanks,

simone

If its an 8V, then it will add a little (not much) ultimate BHP, but this will be at higher up in the rev range and also you'll lose a bit of torque low down. Obviously, it will work (better) with other mods, eg bigger exhaust, port/polished head, etc. Not much point going for a hotter cam without these, in fact.

If its a 16V, you're fraught with difficulties - many people have fitted aftermarket cams, and found they add almost nothing to BHP while losing driveability elsewhere.

thanks paul

do the cheap stuff first, get as much air into the engine as possible and reset your mixture.

there are gains to be had, but choose your spec wisely. a milder cam will give better performance all round but may not give much of a bhp increase at top end. kent gs2 cams do give very good power gains but only out perform standard  cam from about 4000rpm and up. below that, it's down. depends on what you want from the engine.

im putting a cam in my engine only problem is im getting rid of the 1.3l driver and putting in a 1.6l scirocco with flat top pistons and a highlift cam which should take me upto 8000rpm im told the cam will give me between 20 and 30 bhp if you need more info i can find out

jonezi said

im putting a cam in my engine only problem is im getting rid of the 1.3l driver and putting in a 1.6l scirocco with flat top pistons and a highlift cam which should take me upto 8000rpm im told the cam will give me between 20 and 30 bhp if you need more info i can find out

What do you mean "the pistons and cam should take me up to 8000rpm"?

paul_c said

If its a 16V, you're fraught with difficulties - many people have fitted aftermarket cams, and found they add almost nothing to BHP while losing driveability elsewhere.

I thought its normally the 'budget' cams (Kent, Pipers etc) that people have problems with, have heard good things about Newmans and Shricks on CGTI.  But they're really pricey!

Am thinking of trying some Techtonics ones from the states, with teh exchange rate at the moment they come out at around ?250!

paul_c said

jonezi said

im putting a cam in my engine only problem is im getting rid of the 1.3l driver and putting in a 1.6l scirocco with flat top pistons and a highlift cam which should take me upto 8000rpm im told the cam will give me between 20 and 30 bhp if you need more info i can find out

What do you mean "the pistons and cam should take me up to 8000rpm"?

and flat top ones too?

valve benders maybe???

flat face head, flat top pistons and a high lift cam.

why would think bent valves?

cos of this learning curve thing im on,
i thank you for your definition of highlift cam :wink:

i think the 1.3 engine as standard peaks at 6500rpm with the high lift cam it should rev to 8000rpm but it all depends how you want your engine set up either high speed or acceleration depends on what degree cam you need

jonezi said

i think the 1.3 engine as standard peaks at 6500rpm with the high lift cam it should rev to 8000rpm but it all depends how you want your engine set up either high speed or acceleration depends on what degree cam you need

Why does the cam make it rev higher?

dont think the cam will make it rev higher i think lightening and balancing certain engine parts will do that young man :wink:

after taking my time with the car (lol)….
which cam (and other mods  :roll: perhaps) would you suggest if:

the head has been port/polished,
new pistons fitted,
k&n air filter fitted,
and re-bored to 2.0
4 branch exhaust manifold…?

other small mods in mind include new rad, coolant hoses, oil cooler, new bosch fuel injectors, re-balanced flywheel, audi throttle body.

but the main priority at the mo is the cam and pulley set up, recommendations please?

thanks,

simone

Hi all,

…I didn't want to clog the threads so thought it fitting to resurrect an old query which after many moons I am finally at this stage. Do I get some sort of reward for this?…

I have managed to source a new head as the previous owner(s) had actually skimmed up to 1.0mm of the original!! Maybe to assist compression with his P&P job.
The u/s of the head when examined was not even entirely flat, albeit very close.

The block had been bored to about 81.5mm, but I have not been able to assess the gasket fitted. I don't want to chance another 1.8 gasket. Would you recommend a steel gasket from a 2.0 mk3 or other, given the slightly larger bore??

While a new head is being built I am getting a P&P on it. To complete this I am planning a wider TB & looking for a new camshaft.

My preference is for a Kent, Piper, or maybe even a Schrick 276 solid lifter cam. Will be getting a vernier too btw.

The issue is the above cam makers now only have min. 276 degree durations, and I don't want to lose the low-end zip the engine offers. The Cyl.Head builder doesn't advise Newman. Also, I really don't want lumpy idle at all!

I hear Schrick's 276 only comes on song at 3.5kRPM so I don't fancy spending big just for that!
Is there a reason why the Kent & Piper have wider power bands at same/higher cam durations as the Schrick?

Their lobe centres are almost identical 110,110 & 108 (for the Piper). I've had a good rummage on ClubGTi but didn't see any answers

Can you I have your recommendations please??


Ta,

Si