questions about high compression 4kq's with NG/NF/Hybrid and CISE

[JShadzi at aol.com]

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<<Thanks again for your help Javad.>>


Sure, you bet, I love this engine swap stuff  ;)

>
> > -which ignition system are you running
> > -which ignition dist. are you running (I assume 4kq since it has vac.
> adv.)
> > -which fuel distributor are you using?
>
> <<All the above is the stock '85 or '86 4kq stuff.>>

Ok, that's good, the hall windows in the NG distributor are bigger, and can
cause timing issues if not used with the right ignition system.

>
> > -which spark plugs are you running?
> >I am using Bosch W7DTC, tri-electrode, 4 days old.
> >WR7DS is listed as an alternate plug for the NG by Bentley.  Could the
> >silver electrode and resistance be a factor?  It certainly affected their
> >price, by 2x.
>

That is fine, I don't think the spark plugs will make much difference,
haven't IME.

> > -Did you have the head shaved when rebuilt, had it been shaved in the
> past?
>
> >I did not, though the previous owner (who did the P&P job) very likely
> did.
> >Is a thicker headgasket avaliable for the 5 cylinders?

Ok, but you still don't know the compelte history, or if the previous owner
had done it the second time in the life of the head.  This would be good
information to have, or if you could try to get an estimate of the thickness
of the head and compare it to the limits in the Bently.  Nothing thicker off
the shelf that I know of, but there is a company that could make you a copper
spacer for about $100, do a google search, you'll find them.  Not sure that's
what I recommend to solve your problem, however, seems like a bandaid.

> > -Are you using 91 or 92 oct. fuel?
>
> >Whatever is the highest avaliable, usually 92, from Chevron or Texaco.
> >Occasionally I'll be camping in the middle of nowhere and the redneck
> >mountain town gas-em-up will have 91, of unknown origin, but that is rare.

Good, good

> >I don't have a NG/NF piston to compare to.  They look like
> >http://edison.seattlecentral.org/~dleep001/HTpiston.jpg and
> http://edison.seattlecentral.org/~dleep001/block.jpg
>
> > Were'nt those Golfs 10.5:1 comp?
>
> >The Golf Bentley is telling me 10.0:1 for the HT engine.


Hmm, well they sure look right

> >are you monitoring O2 or EGT?
>
> >Alas, I don't have an EGT sensor.  I could rig something with the o2
> sensor
> >and a multimeter then go drive around...
>
Yes, definitely monitor the O2 voltage, EGT is nice because its so accurate,
you can see every little change made in the EGT's, whether timing or fuel
related.

Keep tinkering with it, you'll figure it out.

Also, are you positive you are using the right timing mark, or setting the
initial timing properly?  (I know, but I've done it before, double check it)

Javad