My opinion on 2.1L motor hybrid

[JP Noonan]

This is a response to a personal e-mail, please chime in...

> JP-I was looking through the archivess on pelicanparts.com, and saw you
had
> an interest in 1.8-2.0L combination motors.
>
> I have a set of 914 1.8L heads coming to me, to use on a 914 1.7L case.
>
> I want to run 2.0 crank and rods with 96mm pistons.
>
> Will I get involved with valve train geometry problems, or will I be
> getting so large that I'll have to replace valves in the 1.8 heads if I
use
> the 2.0 stuff?
>
> What did you end up doing?
>
> Any help would be greatly appreciated.


response:
> First thing I recommend is to buy the Tom Wilson book on rebuilding VW
> motors.
>
> The 1.7L case is dimensionally the same as the 1.8L and 2.0L, however I've
> never seen one with windage tray boss or windage tray from the factory. To
> compensate for this I recommend a "tuna can" sump or deep sump. Not the
> finned deep sumps as they hang too low (been there, done that), but the
> smaller tuna can style ones.
>
> The combo you talk of will work, it will not have as much power as a motor
> with 2.0L 914 heads (2.0L bus heads are crap) unless you use carbs and a
> carb camshaft, then the power may be more. The 1.8L heads have valves
> slightly smaller than the 2.0L, also the port design is different. The
2.0L
> heads make more power due to their design but are also more prone to
> cracking and dropping valve seats.
>
> Considering the price of 2.0L 914 heads I'd say you are going the right
way.
> A 2.1 with 1.8L heads should easily put out 100+ hp depending on
induction.
>
> The width of the motors will be the same and the 1.7L tinware will fit the
> 1.8L heads without modification, something that is required if you went
with
> 2.0L heads. Exhaust systems bolt on to any 914 engine as long as the
muffler
> matches the heat exchangers. The 96mm pistons must match the crank and
rods,
> i.e. if you use a 2.0L crank YOU MUST use 2.0L rods (bus or 914 are the
same
> near as I can tell) AND YOU THEN MUST USE pistons and cylinders made for
the
> 2.0L stroke as the wrist pin height is different than the 1.7L and 1.8L
> cranks.
>
>
> I'm going to post this on Pelican BBS just in case I missed something
(never
> happens, as I am of coarse perffect