Building lower block - Looking for directions

[kookk]

I have just done the 2nd phase of my build which is basically a D16Z6 all motor Crower Stage 2 with all the works except a stock lower block. That's where my 3rd phase will be. I intend to go near the limits with my lower block for torque. I used the Stage 2 cams as I don't intend to rev it high just for some safety. Would appreciate any guidance or directions. I am now doing my research and purchasing of parts. Will probably start building the block early next year. 2 options I am looking at now. I am targeting a CR of 12-12.5:1 and my head has been milled 0.08" with Omni Power flat face valves. Intend to resleeve the block and do posting.

Option 1:
D17 block bored to 77mm to give approx 1757cc

This is gonna be very much experimental and slightly more risky. Despite much searching, aftermarket parts like overbore piston, rod, etc... seems to be non-existance. The only resource available is that one piece from HT. Will be getting some help as my builder has successfully done such a hybrid. It's the aftermarket parts that is giving me a headache.

Option 2:
D16 block max bore to 78mm to give approx 1719cc

Safer option but with less engine capacity. Seem to be able to only find the Endyne piston which has compression of 13+. Seems awfully high CR to run. Am I able to get any 78mm PM6 pistons?

[kookk]

Any kind soul able to help me out or give me a direction?

[eg4]

If you wanna bore over 76mm you must sleeve the block

[jimmyb34]

if you staying na dont waste money on sleeving andb oring.. wont do that much for the price...
just run stock bore high comp pistons and call it a day

[s_18]

If money wasn't an issue, I would get a Z6 block sleeved to 78mm.
If otherwise, just some high comp pistons and a 0.5mm overbore.

[kookk]

I would actually prefer to go with a D17 and bore but aftermarket support and information seems minimal.

Money is not that big of an issue. Just want to plan and build it right. Will be re-sleeving and block posting if I go 78mm.

Would love to go boost, however, regulations are really strict where I come from and fines are hefty. Boost on an NA car is considered very illegal.

Where else can I find oversized pistons besides Endynes?

[kookk]

Upz for more info.

I am sure someone in this forum has done it. Where can I source for most of the parts that does International shipping?

[Dweezil]

Pistons are more than likely going to be custom. For parts try www.fm-motorsport.com/shop

[s_18]

I just don't get why on earth you would want to go D17... Because it's like 38ccs more? Or am I missing something?
A D17 block is something totally different from the earlier D engines, so you would need to go with a matching head.
You loose about all aftermarket options, and end up with... A "lesser" engine IMO.

And why not go with Endynes? They are great pistons, and Larry does ship internationally. You can use a thicker head gasket to bring the CR down.
If I could have made my current engine with a 78mm bore instead of the current 75.5mm, I'm certain it would kick a lot of ass.
It rips fairly well as it is, and with 150ccs more, it would be great.

[lemon_juice]

if you want to have the effects of 1.7, youll have to do alittle notching of a 1.6 block and use the crank from the 1.7 because the 1.7block wont allow you to strap on a head from sub 1.7's

[kookk]

I just don't get why on earth you would want to go D17... Because it's like 38ccs more? Or am I missing something?
A D17 block is something totally different from the earlier D engines, so you would need to go with a matching head.
You loose about all aftermarket options, and end up with... A "lesser" engine IMO.

And why not go with Endynes? They are great pistons, and Larry does ship internationally. You can use a thicker head gasket to bring the CR down.
If I could have made my current engine with a 78mm bore instead of the current 75.5mm, I'm certain it would kick a lot of ass.
It rips fairly well as it is, and with 150ccs more, it would be great.

As it is, your build is already making ppl envious! :yum:

Had I known I would be going this far in my build, I would have gotten the Stage 3 instead of the Stage 2.

Well, potentially with a D17 crank and a 78mm bore, I can have a 1800cc SOHC. With the stroke ratio, I will also have a more otrquey engine which suits me better. My country is a small one and I live in the city area. 3/4 of my driving are short traffic light sprints. However, the knowledge to build one and aftermarket option is minimal though. The consolation I have is that my builder has succesfully got a D17 block/crank on a D16Z6 head. It ran for 2+ years untill recently. Suspect the main bearing is on its way out. My job here is to source for the parts.

Endynes eems like the only option so far. I am in my planning and resourcing stage now and if nothing else crops up, Endynes seems the way to go. My head has been milled 0.08". Unless I change head(PnP again), I am gonna have to use a really thick gasket.

[pearl62]

If you want reliablility for street use, then I'd suggest getting Darton MID sleeve kit for a D16 block (not sure if it will work in a D17 block, it might), and then custom 78mm pistons. I'm putting together such an engine over the winter...

[kookk]

If you want reliablility for street use, then I'd suggest getting Darton MID sleeve kit for a D16 block (not sure if it will work in a D17 block, it might), and then custom 78mm pistons. I'm putting together such an engine over the winter...


If I bore the D16 block 78mm it would probably not be Darton sleeves. We don't seem to have the machining skills here to do Darton sleeves. Instead, the stock sleeves will be bored and the inner layer on the sleeve will be replaced with something harder and block posting will be done. My builder has done this on some of the B Series block he built with success.

Apparently there are sleeves for the D17.

http://www.darton-international.com/sl_import.htm