5a-ge 20valve

[oldcorollas]

whoops, wrong term i meant decapacitied i know they are same stroke. as posted earlier

[myne]

I was kinda hoping to prove to you that that'd be a really dumb idea, but it might just work...



The outer ring is the barely visible mark of the headgasket (I hope) and the inner ring was calculated using complex numbers and symbols to be more or less 78.7mm.

[DeftAnesthetik]

the HKS 5a kit was what i was talking about, for those that are not aware or fuzzy on the details it is a crank and pistons that change the displacement of a 4a block and head from a 1587cc to 1720cc not a huge change but maybe enough to make a bit of difference?

[adamaw11]

Interesting, but I'm guessing the cost, and rarity of it probably makes it not very worthwhile.

Still, if I found one of these kits for cheap enough I'd probably consider it. Any idea where you'd get them from, and cost?

[RONA]

I think for the budget better results would be had from either spending more money on the 4ag or building a 7ag, the HKS/JUN stroker kits to make the 1720cc are fooking expensive.

Get a set of custom hi-comp piston for the 7a if you really wanted to and it'd still probably be cheaper

[ed]

jeebuz - could those ports do with some loving with a die grinder or WHAT

[mr2gze]

Interesting, but I'm guessing the cost, and rarity of it probably makes it not very worthwhile.

Still, if I found one of these kits for cheap enough I'd probably consider it. Any idea where you'd get them from, and cost?

I saw a crank on yahoo a few months ago, and as oldcorollas said there were some pistons aswel (low comp). I think they are discontinued now.

Heres one on ebay with ~1 day left http://cgi.ebay.com/ebaymotors/RARE-...QQcmdZViewItem
$749.99US

and heres some pics

http://pg.photos.yahoo.com/ph/stysg/.../ph//my_photos

[DeftAnesthetik]

yeah these are super rare. currently there is the crank on ebay for $750us but no pistons.... you could probably get some custom made or find something that would work. depending on how much more stroke is added maybe you could get a thick enough head gasket to avoid interference with the valves???? or maybe some pistons from a gze? they would drop the top down but should still keep the compression relatively high or if not adding forced induction to a 1.7L "5"age would probably give some impressive results. I am torn on this i can afford it and it would be a unique setup but like adamaw said it may not be worthwhile. I dont want to do forced induction and am looking at the best way to get the power out of my 20v and even thought money is not an issue the best "bang/buck" approach is what i am after. its obvious that no one has attempted this on a 20v i see no reason why it would not work but if all i am going to gain is 5whp then it is definately not worth the investment. thanks for all the replies guys

[Starfire]

You do realize that it is only something like a 7% increase in displacement. In order to fit the kit you would need to do some fairly heavy modification to the bottom of the block in order to clear the rods as well as custom pistons.

With the addition of the 20v head you would need to purchase something like a pair of arp head stud kits, custom timing belt and vernier cam gears.

I'm sure that there will be lots of other things you will need.

Don't get me wrong - if you do it, it will be cool. It probably won't give any huge advantage though.

[DeftAnesthetik]

I am not about to jump into it, I was questioning if any had installed the kit in a 20v. Now though I am curious if anyone here has had any experience with the kit at all. Forget the price tag attached.... what kinda results come with it?

[oldcorollas]

a 7% increase in displacement will give you about.... 7% increase in torque, with a sligth decrease in maximum rpm due to higher piston speed.

in a stock 4A block, as well as clearancing for the crank, you would need either pistons with shorter pin height, or shorter rods.
since no 20V pistons were made for the kit, i would suggest you would be stuck with using either stock 20V pistons for NA, or off the shelf forgies for forced induction, leaving you with shorter rods and poorer rod/stroke ratio.

what would be interesting is to use this crank in a 7A block... and use longer rods. then again, for the descrease in displacement over a normal 7A is it worth it? perhaps if you are restricted to that capacity in racing and rpm was your main goal??

thats my thoughts

[Starfire]

You'd be better off spending the money on a set of cams and and springs for a stock 20v

[DeftAnesthetik]

just paid for the springs, should see them within the week. need to source some cams though