will this 1.7 idea work?

[oldskool rich]

ive heard of a few people doing 1.7s and i want to hav a go.

my plan is, AAZ block, 1.6 crank (lightend/balenced), PD con rods, AAZ pistons (ceramic coated) obviously the compression ratio will be all wrong because of the shorter crank stroke.

if i cut the top off the AAZ block it would sort thing out, without buying custom rods

will this work?

[Luckypabst]

How thick is the block deck vs. half the difference in stroke? Too much shaving and you'll be in the water jacket.

Longer rods?

Chris

[oldskool rich]

i dont know if theres enough to cut off, was hoping sumone will know, are there any stock rods that will fit?

[rabbid79]

I have considered doing something like this, but with a forged 92.8mm crank out of a '93-'95 ABA.  I've done some calculations, and with a 1.9 head, the compression ratio drops to around 20:1 with the stock rods and the thinnest AAZ metal head gasket available.  You'd have 1.84 liter engine with a little better revving capability and still have decent torque.  The compression ratio is also better suited to super-high boost applications.

[jtanguay]

low compression ratio would be great for racing applications (more boost  :twisted:) as the high compression ratio was designed for great cold starting.  an intake air heater would probably help out a lot for those colder starts

[oldskool rich]

so how much should i take off the block? i would like to run mega boost but at the same time i dont want to be tring to start it up for hours each day, its still a daily driver.

i am collecting the block next week, and im gona get the top skimmed off strait away, so cud do with some advice, also is there another IDI piston that has a wider bore than the 1.9 but will take the same rods so i cud bore it out to get more torque?

[MJF]

YouŽll have to cut the block 4mm minimum...

[oldskool rich]

ok 4mm, will that lower my compression? how much difference to stock 1.9 is that? does anyone know how wide the 5 pot pistons are? will they fit the aaz rods?

there must be somthin that will fit :?:

i was thinking that to help me start up maybe a could use a more powerfull starter motor or a 24volt battery, any sergestions?

[Baxter]

http://www.brick-yard.co.uk/VehicleSpecific/T3/info/enginedata/dsl/KYdata.htm

[Vincent Waldon]

Thanks for the link... this is the first time I've seen this:

Dynamic Timing AVL-bosch-Souriau-sun-VLT4139      15* +/-1* @ 900 RPM

[Baxter]

One level up from last link.
http://www.brick-yard.co.uk/VehicleSpecific/T3/info/enginedata/engine.htm

Check JX
 

[oldskool rich]

wow that is amazingly helpfull, that saves me asking about 100 questions

dont supose theres one of those data lists for every car in the world with a good seach engine? :lol:

[Baxter]

There is yes.
I have it at work.
Its called Autodata!
It comes on a CD now, go check e-bay, theres bound to be a cracked copy of it somewhere.
I mailny fix older cars and vans, so upto 2003 is fine for me, thats what I have, infact, no, I recently found 2006, but I have no idea where it is now or I would run you a copy off.

[oldskool rich]

ok so ive took everthing off my dona engine now, im ready to get it cut down, just not sure how much by, the differnce in stroke is 9.1mm if i wanted it to have the same CR id hav to cut that much off.
how much difference wud each mm make to the CR?

if i used a thinner gasket cud i cut less off?

i wud like sumone smarter than me to tell me how much i shud cut off and what gasket, i want it to start up fairly easy and be able to run as much boost as possible

sorry i dont want much do i :lol:

[jimfoo]

From what I remember of my block, I don't think you will be able to cut off enough to have a high enough CR to be able to start it. The passages start to really open up not all that far down.