I have a 99 hatch with a D16y7. I have access to an inexpensive d16z6 and have a couple questions. I am wanting to build a boosted motor and was wondering about using a D16z6 block with the y7 head. Now I have read that the z6 block has a better oiling system and that it is better/easier to boost a non-vtec head. I also dont really want to be having to change the ecu. Just want to get some opinions being that I am new to Hondas and want to do it right. Any help or insight is much appreciated.

 

...

 

I would not put a non vtec head on a vtec block. Either just the complete Z6 motor or swap the vtec head on to the Y7 block. But using the Z6 motor is a better choice because it is a little stronger than the Y7 and has a better oiling system like you said. Along with a much better flowing head, better cam anda better intake mani. If you are going boost a ECU change is a needed upgrade for tuning, you will need to go to OBD1. The weak point in all D series bottom ends is the rods and rods bolts.

 

If you're going to take a Z6 and stick a Y7 head on it you might as well leave the Y7 in the car.

 

...

 

I don't see where he said the Y7 block had anything wrong with it.

If he boosts and tries to use the Y7 head he will STILL have to use an OBD1 ECU with a jumper harness if he wants to have it tuned. If not he will have to shell out close to $1k for an AEM piggyback system in order to keep the stock ECU. This is not an option. If he's worried about oiling then get an oil pump and have it ported and shimmed then get a gauge to monitor your oil pressure. TO top it of use an S2K oil filter to bump up the pressure. I've run boosted on a Y8 and aint come close to spinning a bearing for close to 3 years now.

And I don't know where you people are hearing these crazy things from but there is no benefit to running a boosted setup with a non-VTEC head. Boost loves VTEC. Only people that are poor tuners will tell you to use a non-VTEC head. Doing a swap this way because of misinformation is not wise.

If I were you I'd drop in the Z6 setup and make sure to get the transmission to go with it. Boost and a Y7 transmission with those longer gears is not the best combo.

 

...

 

Honestly I'd rather have a Z6 or A6 block over any D16Y block -- I have no love for those oil pumps, really don't like how the oiling system is put together at all.

Just my $0.02

Got a really good point though -- it's a bitch running a block without the OBD2 sensors in an OBD2 car. Either piggyback or have to go OBD1 which isn't always smog legal.

 

Sorry maybe I should elaborate a little more. Currently I have a bone stock y7 with 220k miles. It runs fine but I want more power so I am wanting to build a boosted motor. I am in no hurry to get it doneand I have a pretty flexible budget for the project. I came across a z6 engine/tyranny combo that I couldn't pass on the deal. It runs fine with no pop outs or grinds and only set me back $100. Now if the z6 is a better build for a turbo then great that is what I would like to use.

The only reason I really wanted to use the y7 head was because I really didn't want to change the wiring in the car. Sorry I am just new and maybe a little ignorant to honda. If I can run the whole z6 set up and keep a/c and wiring isn't too bad then that's what I want. When I build the motor it will be a full build with low compression vitaras and arp bolts etc etc. My goal is a reliable boosted daily driver, nothing too crazy. Also I am located in phoenix and don't know how obd1 will effect the emissions. Again any insight is appreciated and sorry I wasn't more clear from the get go. Also what is the difference in the transmissions between the two because the synchros in my y7 are worn out.

 

Really? Sounds kinda like you've had some dealings with them.

I'd love it if someone would post up some proof or at least some significant evidence that the 6th gen D series
pumps are inferior to the 5th gen. Not that I don't believe it, I just haven't seen any solid facts on this matter,
other that regurgitated forum conjecture.



FACT: D16Y engines have only HALF of the con-rod oil galleys as their 5th gen counterparts. This means
much less flow, which is not as good for bearing life, especially at high rpm.

So, each connecting rod bearing is only being lubed at 1 point per 360º of rotation, instead of 2 points (180º
opposed galleys) like the older D motors and just about everything else, really.



So, how in the world COULD the oil pump provide enough flow at high rpm through one hole? Yeah, let's place
blame on the pump.

 

Please place simple technical questions directly into the thread title -- Title edited.

 

i run a ported y8 pump on my z6 swap. its the crank thats flawed. ive never had a problem running a y8 pump using the z6 bottom end and crank. between the internals of the pumps the z6 does have bigger gears inside and i believe does flow a little more. u can always shim the y8 pump.

 

I hoped you'd pop in. Thanks for the info.

 

Find a system that is A/C compatible. Build the Z6 block for boost and run that. Wire for VTEC, which is easy as pie. Get the ECU socketted so you can run a proper EMS. Get a tune. Done. Don't try to Frankenstein parts if your end goal doesn't warrant it.

 

Ok thanks for all the help, I imagine I will have more questions when I start the build and wiring.

 

what if all I have is a y7 head, I had an a6 head on it and it snapped a cam. Hoping for it to be dailyable