NOO!!! here is a pic:



people keep asking and there is always yes, no, maybe....well you can see there that there are only two valve reliefs not four...

this is the block out of my 88 HF...

 

Yes in order to use the vtec head are any other 16 valve sohc head you need to change the pistons to ones that have four valve reliefs on them? But the head does phisically bolt onto the hf block.

 

http://www.hondaswap.com/articles/viewer.php?id=52

that is an article about putting a 16v head onto a 8v block. it says nothing about the valve reliefs on the pistons. i would think that it would work, but it would be better to use 4 valve (reliefs) pistons.

 

yeah but he said a VTEC head
VTEC valves will go longer and lower..... giving him a very bad if no clearance against the 8V block and pistons.....

http://www.hondaswap.com/articles/viewer.php?id=52

HAHAHAHAHAHAHAHA check this out: "and put down 112, 109 to the wheels. With this type of power, look to be pulling on GSR’s, Civic Si’s and even the occasional unsuspecting Type R owner.

yeah right.... i put close to 120 to the wheels and i dont see that happenin


[Modified by USDM 4G VTEC, 11:28 AM 3/13/2003]

 

why would the vtec valves be longer? just something they do? or something you made up?

 

This says it all:



I don't think there is any thing to discuss.

 

what the engine code on the hf motor?? does it start with a B im not sure maybe im seeing things.. i was messing aorund with my crx last night and i looked at the stamp i thoguth it said B.or D i dunno its covered with grease

 

Its a D15xx

 

It is a myth that the D15b6 cannot be used for a mini-me swap, I have personally never seen a Z6/y8 head on one, but people have claimed it works. I dont see how its possible. When vtec engauges the cam uses a different profile using more duration and more lift, thus sinking the valves down closer to the pistons. Maybe their is enough clearence without the valve reliefs.. who knows...?

However, the D15b8 (Civic CX) engine, which is almost identicle to the D15b6, is also a 8 valve engine, but I am for certain it has 4 valve reliefs per piston. So I dont see why you couldnt do a mini-me on one of those.

Jeff

 

pulling on an unsuspecting type R yeah right what a retard.... who wrote that article anyways?? the obviously have not seen this thread....

Blaze

 

Why are people retarded enough to try and attempt this in the first palce. I mean how much possible HP could you get from putting a VTEC head on an engine with 5500 RPM rev limit. Geez VTEC doesn't engage till 4400-ish, you get a whole 1000RPM worth of VTEC pull? WTF I wish some people would use their brains, instead of coming up with 1/2 assed ricer ideas.

[ricer stunna lingo]A VTEC head on mah 62hp HF engine will give mah one million HP to da wheels y0![/ricer stunna lingo]

<--- Pissed off by dumbasses

 

Why? because they have 62hp and dont have very many alternitives (other than a full swap).. I personally think its a great idea, the HF and DX bottom ends are nearly identicle, same bore/stroke (rod stroke ratio) The 5500 readline was due to the ECU and weak flowing head. In theory, if you were to put a Z6 head w/ SI intake manifold and correct ECU (management) you could easily see over a 40-50HP gain on a HF/CX engine..

I just dont see this happening on the B6 w/ the 8 valve reliefs.. a CX.. maybe

Jeff



[Modified by AbaZ, 9:28 PM 3/13/2003]

 

I think the valve reliefs are are put there for a reason. I could be a painful learning process to find out if it really works. Why not just buy a complete z6? They start at like $300. Just my .02


[Modified by CamoHatch, 2:59 PM 3/13/2003]

 

I agree also. I understand if they have a low budget and all, but that really to me wouldn't be worth my time to do, when you can find complete z6/y8 motors everywhere, for 200+, complete sometimes 350+, just don't waste your time, save some money, and just change it out, it would be easier, probably last longer and be more realibe.

 

You're wrong about the rev limits on the DX engines. My revlimiter is at 7000 rpm, and that's how it was stock. I take up that high at least twice a week and haven't had any problems at all. So, as long as the valves don't interfere, I really don't see why you wouldn't be able to throw a SOHC VTEC head on. PLus, if you're really worried about how late in the power curve the VTEC kicks in, get a VTEC controller and lower the VTEC crossover.

 

I never said anything about DX engine's now did I? I've had a DX before and i'm well aware of it's rev-limit. I said the HF engine, which does have a 5500 rpm rev-limit.

 

I highly doubt that you can put a Vtec head on that. Two of the valves would most likely be on a collision course for the piston and the only way to fix that would be a monsterously thick head gasket which could defeat the purpose. If you are on a budget just buy a CRX Si motor. I am sure you can find one cheap, and if you can't I am sure I have a few lying around at the shop.

 

OMG do people accually read my post? that was the point of this post that you cant do it....

 

Oh I didn't see the NO part...sorry.

 

8 valve reliefs....16 valve head....enough said.

 

calm down there cheif.....the rev limit is there for gas milage hence HIGH FUEL....im not saying this is a good idea but if the HF had 4 valve relief pistons it wouldnt be a bad idea at all....d15s have a better rod stroke ratio than a d16.....and with the raising of compression with the z6 or y7 head it would create a respectable amount of hp just with a stock z6 ecu....not as much as a turboed 2.0 but more than a stock crx si....and remeber power to weight.....in my 88 std i have a d15b1 stock 70hp not the best engine from the factory its the hf of civics.....cat at the motor and all same thing....with a d16y7 NON VTEC head ihe a 91 si ecu and a z6 intake manifold it makes like 130 crank hp 15.2 in the quarter with a decent 60 ft on 13inch steelies stock with interior intact.....and it would beat a type r if the driver didnt get a jump on it but time for time no it wouldnt beat a type R....yeh some people say stupid **** but its not a bad idea dont put people down for trying new things...if we didnt try **** how would we progress in life we would sit around and do nothing

 

Sorry I was having a bad day yesterday I totally respect the people who try new things, and I have NOTHING against the d-series. I've got a 91 Si with a A6/Z6 mini-me that i'm thinking of turning into a 12:1 c/r B16 killer. As far as the HF goes, if people wanna beef it up then go right ahead. It's just as stable a platform as any of the other d15's