Why would you put a 1.5 head on a 1.6 block?

[ventureforth]

Is there and advantage?  I saw this http://www.vwdieselparts.com/1.5-1.6.htm  and was curious what the incentive is...

[rs899]

As far as I know, only because you happen to already have one and want to use it.  Perhaps the cam is different?  Tyler can chime in here....

[theman53]

Yeah I think it is more of a thing were the owner can't find a mechanical 1.6 head and has a 1.5 head.

[Baron VonZeppelin]

Same as what they said.

It also raises comp. ratio a bit too.
Like 23:1 isn't enough already ...

[84tdrabbit]

25.5:1 IIRC

[ventureforth]

Okay, that's what I figured.  I read some posts about higher CR and larger swirl chambers, but figured it was only a "well, I got a 1.5 lying around so it's free" sort of deal.  I actually do have a 1.5 lying around and need to do a HG soon, so if the 1.5 was an improvement, I would have swapped it on.

[84tdrabbit]

the 1.5 has considerably smaller swirl chambers...

how would BIGGER swirl chambers make MORE compression?

and its not a direct bolt on swap for the head..

you kinda need to make an adapter bushing for the front oil return..

[RabbitJockey]

i thought 1.5s and tds had the same pre cups?