The great 5E v 4E timing debate.

Sharagath

Member +
interesting discussion, but now real figures on the valve timing.

i have put this thought on with my tuners.
the first ting they put against it was the amount of tooth's of difference.
it is not a tooth or 2, it is a reasonable amount of tooth's.

it would be interesting to see the difference on some pictures.
recently i disassembled my 5e ignition unit(not needed anymore), it could be also an internal difference in the rpm pick-up and firering control loop.
 

billybob

Untrusted Seller
interesting discussion, but now real figures on the valve timing.

i have put this thought on with my tuners.
the first ting they put against it was the amount of tooth's of difference.
it is not a tooth or 2, it is a reasonable amount of tooth's.

it would be interesting to see the difference on some pictures.
recently i disassembled my 5e ignition unit(not needed anymore), it could be also an internal difference in the rpm pick-up and firering control loop.

so what are you saying :confused:
 

Sharagath

Member +
so what are you saying :confused:
missing a conclusion i see now.

according to my tuners there is a reasonable differens in vlave timing between the 2 marks, but how that will effect they couldn't say.
they didn't recommend 4e marks on my 5e

i need to take a look on the position difference to give my final conclusion.
as my car has a standalone ECU, i think i can (if i switched) role out the ignition difference.
 

goldenvtr

Member +
maybe its worth counting the teeth diffrence and trying in the middle of to 2 markers. obviasle buying an adjustable pulley is a simpler solution but being as we have a linked in/out cam its pretty anoying.

now i dont know if this is true but the way my car feels and sounds the 5e markers i think it may hold the exhiast valves closed for longer creating more pressure in teh cynlders hence more torque.
 
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Texx

Super Moderator
it would be interesting to see the difference on some pictures.
recently i disassembled my 5e ignition unit(not needed anymore), it could be also an internal difference in the rpm pick-up and firering control loop.

That's an interesting point, the stock ECU takes the Ne signal from the dizzy to determine engine speed and the G signal to identify each cylinder at TDC. The ECU compares the Ne and G signals to calculate crankshaft angle. If you alter the camshaft position you also alter these 2 signals which leaves the possibility of the ECU incorrectly calculating the ignition and injector timing.

Are you guys using the 4E or 5E distributor with 4E or 5E camshafts? I'm not sure if there is any real difference between the 2?

Personally, I would ignore the timing markers on both the crankshaft and camshaft pulleys, get yourself a dial gauge and time the engine up manually.

Have a read of this to get a better understanding of what I mean:

http://www.burtonpower.com/technical_1/camshaft_fitting_timing.aspx

Make your own TDC mark on the crankshaft pulley and time the distributor at 10° with a timing light.
 

finx

Member +
thats an excellent link.
completely agree with you, to get best results your would be better off manualy timing it, as you are supposed to when installing any aftermarket camshafts and dialing them in.
 

Texx

Super Moderator
You'll never get the cam timing spot on without using an adjustable camshaft pulley, but your probably going to get it a lot closer than just guessing which timing mark to use.
 

Sharagath

Member +
as i'm reading this correctly.

it is better to use an adjustable cam gear to alter the in and outlet timeing and not the ignition(by doing different timing mark).
 

jam

Member +
Hi,I set my friend 5efte engine to 4e mark the engine start fine and seem to boost earlier but can`t set the timing to 10`degrees as the distributor max out the adjustment mark its actually 15 degrees. Any idea how to set it to 10.Thanks
 

jam

Member +
Hi,Thanks for your reply I check the car timing mark all dot are align correctly, what if I skip one tooth on the cam gear to make the timing drop to 10.Can it cause harm to the engine.Thanks
 

billybob

Untrusted Seller
Hi,Thanks for your reply I check the car timing mark all dot are align correctly, what if I skip one tooth on the cam gear to make the timing drop to 10.Can it cause harm to the engine.Thanks

you might want to check your tps lad as that might be your problem
 
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