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Engine Specific Info and Questions => IDI Engine => Topic started by: ventureforth on August 13, 2010, 02:40:49 am

Title: Why would you put a 1.5 head on a 1.6 block?
Post by: ventureforth on August 13, 2010, 02:40:49 am

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

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: rs899 on August 13, 2010, 04:56:47 am

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....

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: theman53 on August 13, 2010, 05:31:21 am

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.

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: Baron VonZeppelin on August 13, 2010, 08:19:33 am

Same as what they said.

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

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: 84tdrabbit on August 13, 2010, 09:53:21 am

25.5:1 IIRC

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: ventureforth on August 13, 2010, 01:51:17 pm

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.

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: 84tdrabbit on August 14, 2010, 11:45:42 am

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..

Title: Re: Why would you put a 1.5 head on a 1.6 block?
Post by: RabbitJockey on August 14, 2010, 03:08:24 pm

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