I have 7:6.1 compresstion with bd10 cams and a t34.63.

I have just bought a new cylinder head which I will get ported to the max.

What cams do you guys recommend..I want the car to have more low down and mid range power and response.

Cheers

 

If you want low down and midrange, don't port the head, especially if you are using a T34.63, std ports , std exhaust cam and either a std inlet or a BD14 inlet for a bit more top end......

 

can I use a bd14 without having valve cutouts in the pistons?

 

I don't think so, but if low comp maybe? But I doubt it

 

bd1os wont supply power till later in the rev range

ive tried this combo myself and wasnt at full chat till 4600rpm

 

sure you ned valve cut outs anything above a bd10

thats why i got my low comp pistons with the cut outs, but i will be running a 7.2-1 c/r

 

i have twin bd14s,and my head is on last skim

and my cosworth racing pistons dont have cut outs and have been inspected and no valve crash

but im pretty low comp

 

what cams would bring the boost on a little lower if at all possible then.

 

standard at the stage of tune

 

What if I had a gt30 or a t38 which I am planning to use....

 

then you will need head work with a combi of a bd12 inlet standard exhaust or some have used a 14 inlet with a standard exhaust cam

 

Mate, decide EXACTLY what power and torque you want, and where you want it. THEN spec your engine or you will end up with a big pile of expensive mismatched parts

 

I have had my current engine for 3 years now. Built by myself and mapped by msd. covered 15,000+miles with alot of track and santapod visits. Just want a change and just gauging where to go.

I have I have 7:6.1 compresstion with bd10 cams and a t34.63.
Forged pistons in a linered 200 block with greys. I run ALS also.

I want 450-500 but with the lag slightly reduced or kept the same and I want the car to idle properly which I have never been able to do with the bd10's

I was thinking of changing the turbo to a roller bearing t38 from r and b and fitting standard exhaust cam and maybe a bd14. I have a new unskimmed head in 100% condition which I was going to get opened up a bit.

Any one with experience of this spec?

 

why could the car not idle on the BD10's?

 

Standard exhaust cam will bring the torque in a lot sooner in the rpm range.

 

It does idle but not as smoothly as it could. I was told by a few tuners this is what happens with two bd10's fitted as they overlap ?????

 

and they are right thats how mine was until a changed back to standard

 

hi jay , i have a bd12 inlet and standrd exhaust i have looked up the lift and duration of this cam and it seems to have less lift than a bd10 and standard cam
burton list

bd10-lift 8.6 duration 264

stock -8.5 -241

bd12 -8.4 - -247
so has it got a differnt lift rate to a bd10 and standard ? or am i missunderstanding
cheers gary

 

I have BD10 inlet BD14 exhaust, car pulls from 2000rpm right up, 360 ATW.[/img]

 

Alan said your car came on boost real early and worked well with those cams, im going for something a bit lairyer so see what thats like.
You dont have a graph you can put up do you ?

 

Where can I get a roller bearing version of the T38

 

Think Harvey Gibbs is working on one justnow, not sure if it will be only available through him or if CR Turbos will be selling them.

 

right final question.

I have bought a T38 roller bearing turbo after good reports from some trusted people. Also bd14 inlet cam which will be used with a standard exhaust cam. My bottom end is already sorted. Aiming for the 450+ safe mark so last thing is the head spec.

I have a mint unskimmed head and want to know if the above spec can be reached without porting and polishing. I just dont want to spend a load of money on getting it re worked if it is just going to make the car less responsive etc.

 

im running twin bd14`s on a standard head (for now)

and my cams having been dialled in force the boost in earlier on midrange(t4)

but right low down its sluggish as hell

hope this helps you

 

Think the head becomes restrictive over 400 bhp you might make 450 but you will make it alot easyer and with less boost/stress on the engine if the head is ported.[/list]