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will this 1.7 idea work?
by
oldskool rich
on 17 Apr, 2008 17:32
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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?
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#1
by
Luckypabst
on 17 Apr, 2008 17:52
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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
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#2
by
oldskool rich
on 17 Apr, 2008 17:58
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i dont know if theres enough to cut off, was hoping sumone will know, are there any stock rods that will fit?
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#3
by
rabbid79
on 18 Apr, 2008 21:08
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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.
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#4
by
jtanguay
on 18 Apr, 2008 21:24
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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
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#5
by
oldskool rich
on 19 Apr, 2008 05:59
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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?
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#6
by
MJF
on 19 Apr, 2008 10:06
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YouŽll have to cut the block 4mm minimum...
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#7
by
oldskool rich
on 19 Apr, 2008 15:38
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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?
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#8
by
Baxter
on 19 Apr, 2008 16:33
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#9
by
Vincent Waldon
on 19 Apr, 2008 16:43
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Thanks for the link... this is the first time I've seen this:
Dynamic Timing AVL-bosch-Souriau-sun-VLT4139 15* +/-1* @ 900 RPM
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#10
by
Baxter
on 20 Apr, 2008 13:05
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#11
by
oldskool rich
on 20 Apr, 2008 17:52
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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:
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#12
by
Baxter
on 21 Apr, 2008 13:40
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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.
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#13
by
oldskool rich
on 28 Apr, 2008 09:13
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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:
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#14
by
jimfoo
on 28 Apr, 2008 09:21
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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.