Longmans Btcc Gti6 Camshafts

[Batfink 201]

Anyone know much about the different profiles they offered.

I've seen a head and cams for sale and apparently there are three inlet variants and i'm after details such as where peak power is in the rev range etc

 

Kev

[welshpug 1,662]

found this pic but no details

 

 

then I found this thread;

 

http://www.306gti6.com/forum/showthread.ph...7&page=last

 

basic gist is that they're pretty much standard lift but serious duration, I think they varied from 250 to 275 bhp, hard to find much more about them.

[Cloverleaf 1]

That's some serious duration in that bottom pic!

[James_R 3]

Look at the catcams supersport ones with std lift huge duration, much better profiles out there unless the regs of your class bind you to std lift??

[brumster 135 1 Cars]

FWIW, Evo 2 profile (and I'm not sure if that's the same as being dicussed here) should be good for 250-260 brake given other associated gubbins, but I won't know the power range until I've dropped it in, mapped it up and taken her for a spin.... but suggestion was there would be no need to extend over 8k even on solid lifters. A fresh BTCC-spec lump from Longman should push out 285 on their dyno if it's latest spec, but obviously with that you want a fair few others special bits in there

Edited April 28, 2009 by brumster

[Batfink 201]

just been chatting to Matt at QEP

Apparently those cams will make it a bit crap off cam especially with a lower capacity than the gti-6.

I would be better with more lift and less duration to get a better spread of power...

 

K.

[Cameron 16]

Yeah the whole point of those cams is to fly the valves so you can actually run more lift than standard but still pass scrutineering, hence the steep ramp and flat nose! So they probably won't be much good below 6K.

[Batfink 201]

well i'm speccing up the engine to happily run at about 8000rpm + , but if I can get the same power with a better spread low down then thats probably for the better even though it wont ever see a road.

[Cameron 16]

Depends what you're using it for, which I guess is just for racing, and what tracks you'll be driving. I don't know too much about UK tracks (or any others for that matter) but as long as they aren't ridiculously tight then you might be able to get the most out of those cams. You'd have to do your homework and get the right springs etc to make the most of the floaty profile, and be careful with clearances.

Edited April 28, 2009 by Cameron

[Sandy 191]

Cams are highly relevant to the rest of the package. Cam choice isn't a linear scale, there are alot of variables to take into account. If you're having an engine built, the builder should specify the profiles to suit the overall picture.

[Batfink 201]

there lies a problem.

I'm going to build it! Or try and give up before giving it to someone else....

[welshpug 1,662]

there's a solution to that, speak to someone who can spec the cams for you based on the parts you want to use and how you want it to work

[Batfink 201]

well i've been recommended by one - the catcam 4903270

or using the inlet of the 4903279 for both inlet and exhaust