Posted 07 June 2004 - 07:21 PM
Hopefully i will be putting all the bits of my engine back together in the next week or two and as pretty much everything will have been reconditoned is it worth doing anything to the timing while its stipped down??
Any advantages of duplex?
Is it difficult to fit duplex?? Do i need a new timing cover?
Whats the pupose of adjustable timing, surely its factory set correctly or have i missed something when reading how to align the timing gears when refitting??
Posted 07 June 2004 - 09:10 PM
Posted 07 June 2004 - 09:30 PM
If you can't afford a vernier set, then use offset keys to get the correct timing.
Posted 07 June 2004 - 10:19 PM
As a comparison when I worked in a Ford dealer we used to get many cvh engine fords in running rough especially after they had had Unlead conversions (a simple adjustment of the ignition timing) In almost all cases what had happend was whoever reset the timing. connected the light up and adusted the light to the rcomended 8 deg in place of the standard 12 deg.
What you were actually meant to do was connect the timing light and then see what the light said the timing was, in practice this varied from 0 deg to 20 deg, then retard the timing by 4 degs. ie if the timing was 17 deg set it to 13 deg.
Posted 08 June 2004 - 06:00 AM
I don't know what engine you're putting to gether, but unless it's an absolute monster spending all its time at 7000rpm I wouldn't bother fitting a duplex. The later simplex chain with the tentioner (correctly) fitted is fine.
I've never used a duplex (mainly to save weight) and have never had a problem. I now use a belt drive but only because I was given it for nowt.
It is worth timing it in properly though. as mentioned using an off-set key.
Posted 08 June 2004 - 07:15 AM
The acuracy of cam timing and ignion timing is controlled by the machining of keyways, pulleys
Get it now?
Sorry if it was not too clear
Posted 08 June 2004 - 11:48 AM
Cheers...i think adjustable timinig is out of my budget and am using a standard cam so may stick with the simplex...unless anyones selling an adjustable set up??
Thanks for the advice ...
Posted 08 June 2004 - 01:09 PM
Posted 08 June 2004 - 05:04 PM
The only thing I would recomend is that you buy a new chain and tensioner pad. The cahins stretch and the pads wear, and both are very cheap.
I would only fit an adjustable chain or belt kit if I was fitting an aftermarket cam, or after every last ounce of power from the engine.
Posted 08 June 2004 - 06:51 PM
The tensioner snapped in half when i was taking the pulleys off and was well worn anyway. Think the chains are only about 4 quid so i'll get one of those too, i presume i should replace the tensioner rings at the same time and then hopefully should be OK. Think i'll also get new cam followers as i don't have the followers to go with the cam i'm using so its probably a good idea....
Just out of interest do they use offset keys when the engines were originally built or is the timing on standard engines always out??
Posted 08 June 2004 - 09:20 PM
Posted 08 June 2004 - 09:34 PM
Posted 09 June 2004 - 07:55 PM
Hopefully i'll be gettin the engine back together soon so i'll soon see what shes gonna run like - after all this is the first car engine i've ever rebuilt
Posted 09 June 2004 - 08:42 PM
I wouldnt count on it, 3* could throw the timing miles out, just leave it as standard.
theoretically a 3 quid offset key could make my engine more powerful
The tensioner rings you say about, are they the ones on the cam sproket? If so, dont get new ones jus use the spoket of a later engine. If you have a tensioner pad you dont need the rubber tensioner ring too.
Posted 09 June 2004 - 09:17 PM
I think the "3" Adam is talking about is the guess I made for the cost of the offset keys in the U.K.... not the amount of offset. Since you select the number of degrees of offset you need based on measurements... it won't be "out" it would be spot on. If your old stock arrangement was WAY out this could make more power for you but realistically, with a stock cam and no changes to the combustion chambers or ports it may only slightly improve the power you had.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users