sh!ft

ok so we all(or most of the people here have seen) know i blew my motor last nite by throwing a rod. any ways ive been doing some research and have come to this conclousion, the 88-89 d16a1 pistons with integra ls rods going into a d15b7 block running a d16z6 head using the z6 accessories(water pump etc) mated with a y8 head gasket will give me the best outcome as far as compression and power.


who can prove me wrong?

jhammond_82

iTrader: (1)

me!! ls block, pr3 pistons, pr4 rods, pr4 head, = 11:8.1 . lol, anyway, that setup will work, but the d15 block might not clear the ls rods. i thought the d16 blocks were the only ones that would clear? i'm not sure. you might however be able to get the block machined so the rods clear. but, it might be too much money to do that.

sh!ft

hlaf the stuff im doing machingin wise is almost free so im not worried about that

hatch_kidb18b1

Why not just use new d15 rods with zc pistons y8 head and headgasket and be running 12 something to 1 compression

jhammond_82

iTrader: (1)

man, idk, thats pretty high compression if you ask me. you'll need to use a high octane fuel for that kind of compression. do a vitara build and boost it.

hatch_kidb18b1

Well you do have a point but I'm running almost the same setup but more compression and still on pump gas runs great just make sure you get a good tune

sh!ft

edit: so instead of using the 88-89 pistons im going to just use the a6 and get 11 something to 1 and be able to run regular fuel and stay safe/streetable

BUT, i am going to go oversized. any one ever done this build before using oversized pistons? the block i have selected already had a block cylinder guard installed.

radex7

Well, I am in the process... B7 block bored to 76mm, A6 head, Y8 cam gear (I think), it is just taking me forever...

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/engine-mismatch-2406761/

Several other guys, if not here then on D-series have done this combo with some impressive results for both performance and efficiency, and since waaaaaaay more knowledgeable then me - I am just following their footsteps.

8VEYBEYB

what pistons are you ^^ using?

dephtone

If you have a REALLY good tuner in your area, I'd run bone stock z6 with P29/PM7 (d16a1 pistons or DOHC ZC) will net you ~12.05:1 compression.

Some say ~12.5:1 compression is a safe bet with 93 octane and a good tune.

Also LS rods are the same length as d16/d17/d15b/z1

sh!ft

so would or wouldnt i have to shot peen them?? im already gonna take the head/block/flywheel to the shop for balancing/cleaning.

dephtone

stock z6 rods have been proven to 300+ whp, Full-Race had their boosted z6 running 400 whp with just arp head studs.

If you can get it done for within your budget then you might as well do it while the motors apart for the extra peace of mind.

sh!ft

well heres the thing, one of the guys at my shop owes me a favor or 2 so i figured since i already will be picking up the block, tearing it apart, and most likely taking the head apart, why not take it all the way down to the bare and rebuild it the right way? i was pissed at 1st about the motor blowing(and kinda felt cool when i saw the motor blow) but now im actually excited about doing this. this gives me more incintive to paint my engine bay as well while im doing this.


i think i will make a video and take pictures of the build as we go. hopefully i will be done in about a weeks time or so. not bad for a random part up with gewt results LOL!

dephtone

What happened to the other motor? I read that you blew it. Did you hook up VTEC to a switch like you were saying in one of your posts? Either way, hope this build goes good for you.

sh!ft

it was hooked up but the cam seal went out, thus all the oil leaked out and boom! rod through block and dent in hood

n3h3bkau

Okay... lets start at the first problem...

LS rods and a D15 crankshaft.
1. LS crank journal - 48mm
2. D15 Crankshaft - 45mm
(Also don't forget approx 0.022" will need to be taken off both sides of the crank end of the LS rods to actually fit)

LS Rods and D16 pistons (excluding 98-00 GX Pistons)
1. LS Piston journal - 21mm
2. Typical D16 piston journal - 19mm

That's just a couple quick issues with your rod choice.

If I was just making something for the fun of it I'd do a little stroker build...
D17 Crankshaft (depending you might have to machine the snout to fit your crank pully)
D17 Oil Pump
LS Rods (sides shaved .022" each)
PDN 98-00 GX Pistons (accommodates for the longer stroke and are domed)
Z6 Block
Z6 Head
PDN 98-00 GX Pistons

Ahknodd

^^I've heard that set up is bitchin'. Need a lot of machine work, so that might be a route you should go.