comp ratio to suit camshaft

[LJDB 103]

what would be the best/highest comp ratio to run on this sized camshaft.

not sure on the manufacturer but i had it read by crow.

inlet lift .502 exhaust lift .524 

inlet duration at .050" 226, exhaust duration at .050" 234

lobe sep 110

advertised timing inlet open 25 close 65 exh open 69 close 29.

any info would be good if anyone has used this size cam before.

 

[Clevo120Y 815]

9.5 would be my safe opinion

[matt_lamb_160 252]

I think low tens would be pretty safe assuming you are using petrol. But mid to high 9s would be fine.

 

The cam will pull from 2200rpm up to 5,000ish I think, but lift is low for duration.

[slydog 7,873]

Hey bud look who's here...LOL

[matt_lamb_160 252]

Yep. Did you think you could hide forever?

[slydog 7,873]

Now I'm worried...LOL Hang around bro,good place this and people could use your input.

[matt_lamb_160 252]

Will do. Thanks mate.

[LJDB 103]

would there be much gain in changing cam to the crow 650 from the one stated above.

http://www.crowcams.com.au/media/catalogues/19.0%20XF_all.pdf

[matt_lamb_160 252]

14650 is a slightly better cam. But if I had what you have I wouldn't buy a 14650. If you are looking to buy one, Camtech make a similar, but better cam than the 14650.

 

What are you doing with the car?

[LJDB 103]

The car is a Te cortina on club rego so doesnt get driven much. The reason i started this thread awhile ago was because i was having trouble with pinging and was planing on decomping the engine. Comp was around 11.1 before i put a head saver shim in to lower it to around 10.5. I asked about the 650 because im not to confident with the shim and a cam change might be a better way to drop the cylinder pressures.

[matt_lamb_160 252]

Could try a:

 

Camtech CT142510(a)

 

http://www.camtechcams.com.au/ford_6cyl_xflow_hyd.html

 

With good fuel and correct timing should be ok with 11:1. Is it manual or auto? If auto you will need a 2,500+ stall. Really want 3.23+ diff gears as well.

 

Is there anything special about the head? You could just swap it or have the chamber relieved a bit?

[slydog 7,873]

Quintin runs the 517 in his mild EFI xflow powered XF to run 14.7 @ 92 MPH in a street based car on street tyres,no MT's and a 5 speed he drove 12 odd hrs to race with then 12 hr's home again.Beat alot of cars that weekend in it he did...

[LJDB 103]

manual with 3.7s, the head has had bit of porting thats why i dont want to change it. i asked a local head shop about relieving the chambers and they said it wouldnt drop it much. its a early d head with a heap taken off.

[matt_lamb_160 252]

D as in it has a D on the side of it near the intake? If so a fair amount of material can be removed from the chambers.

 

If you go the Camtech you will want roller rockers.

[matt_lamb_160 252]

I was going to run the 517 before I decided to turbo. Kind if wish I just cammed it.

[slydog 7,873]

Thing about Q's times is on a perfect hook up it's a 14.3 sec car for what is a pretty mild set up really.

[XFGHIA747 76]

I ran a custom camtech 520a-110 545in-ex cant think of rest of specs loved it had great power up top between 1800-5800

YT roller rockers ran fine with 10:1 on 95+

slightly worked ports only done self made good difference 153rwkw on good tune, running 465 holley..

[wagoon 2,429]

Would a solid cam bleed more comp off than the hydraulic cam? If the car is only a weekend car and you are going to have to get new lifters and upgrade to roller rockers if you up the lift on a hydraulic anyway.

[slydog 7,873]

Well lobe sep and duration have a bigger impact then cam type but I agree solid will produce better results for sure.

[LJDB 103]

I already have non adjustable YT rollers. What is camtechs pricing like. I have easy access to crow as I work near by, last time I was there I think it was about $500 for a cam, lifter and timing chain set. 

[wagoon 2,429]

Is the OP more likely to find a cam that bleeds off more comp in the solid range? Probably should have asked it that way first.

LJBD do you have a limitation on how lumpy you want the idle? Would you go a solid cam?

[matt_lamb_160 252]

Last time I checked Camtech were cheaper than Crow and they will ship the cam to you.

 

Hope your bottom end is good.

[slydog 7,873]

Non adjustable rollers mean no solid cam just a hyd unit.And yes Camtech have better suited cams for a xflow and cheaper.

[nos2 751]

Camtech also have a lot of profiles not listed

[PRO250 1,506]

^^^^^^^my blower cam was one of there funny ones bit of this bit of that LOL