Camshaft Timing

[2ltrrabbit 0]

Hi,

Can anyone point me in the right direction as to setting my cam perfect.

i have a vernier pully and need to know exactly when the inlet vavle should be at full lift after tdc?????

i thought i seen somewhere it was 116 degrees

for a 1.9 8 vlave

cheers

Edited April 1, 2010 by 2ltrrabbit

[martyn180 9]

what cam, and do you have a dial guage?

[Cameron 16]

110 ATDC is a good starting point for most cams. And definitely use a DTI.

[welshpug 1,661]

As Martyn mentioned, you need to know which cam and what the specifications are, here's a recent topic about the very same thing.

 

http://forum.205gtidrivers.com/index.php?s...p;hl=dial+gauge

[petert 588]

You'll find it far easier to use the lift @ TDC method if the engine is in the car. There is more chance of error using the lobe centre method due to dwell at max lift and the inability to read the crank shaft position accurately. I can't recall the exact figure for that cam, but something around 0.060" to 0.070" will be a good starting point.

[2ltrrabbit 0]

ok cheers guys,

engine is out and i've used the dti to find true tdc. also used the dti to find true centre valve lift for cam too. so

my thoughts were that the standard cam has a duration of 234.5 for a 1.9 which should open att 11.5 degrees befor tdc and closes 43 degrees abdc. now that would give me a full valve lift at 117.25 atdc. if i were to use a mild cam with high lift and a 280 duration, should i set it at 135 atdc or at 115??? obviously one would give earlier vavle opening and later valve closing and the later would open the same but close much much later.

hope you follow this small blog ...

cheers

Edited April 2, 2010 by 2ltrrabbit

[welshpug 1,661]

I don't follow

 

if its a standard cam, just use the standard pulley unless the head has been given a heavy skim.

 

if its an aftermarket cam then find out the manufacturers data and set it as stated.

[2ltrrabbit 0]

ok

its a 280 cam similar to kent and piper mild cam, i used the standard cam specs to show that the full valve lift is mid duration. now when you use a 280 duration do i set the cam to open at mid duration at the same point atdc?

[welshpug 1,661]

no, you set it to whatever the manufacturer of that camshaft says.

[2ltrrabbit 0]

just had a look at piper and they use a 106 setting so i'll give that a go 1st and have a play...

 

cheers

[welshpug 1,661]

i'd find waht the manufacturer of the cam says, it may be different to piper.

[2ltrrabbit 0]

well they seem to be all within 10 deg of the standard so i can use the vernier to tweek..

[martyn180 9]

as Mei says, what does the manufacturer quote? What cam is it?