Hey guys so I was going to do a stroker d17y8 build but I changed my mind (happens a lot) espcially since people over seas practically throw the d14a motors away for free (shipping would be a pain, I know) The D14a4 I am currently looking at on ebay has a r/s ratio of 1.74, perfect for high revving up to a certain point since their rods are rubbish apparently. but it should be good for up to 8k rpm from what I've read.
So basically with a bottom end with a square r/s ratio I want to build a Y8 head (I want to stay obd2 for simplicity sakes, and just use an obd1 jumper harness to tune) with possibly a delta 264/272 regrind with upgraded springs to take the 8k rpm and do a slight p/p on the head for it to breathe better to take advantage of the cams

I really want peoples input on this because I really want to do this and I don't think I've seen anybody in the US do this and I would like do be one of the first if nobody already has done it and to motivate anybody else to do it. I've seen people get around 120whp with just a mini-me vtec swap which is the same power as a d16 but with a better bottom end.

 

bump?

 

i'd stick to you'r y8 idea if you're set on the SOHC. there's going to be more than just upgrading the springs+retainers to rev to 8K and would you even be making power at that level ? something to consider.

 

What else would have to be done? I would like to start taking the car out to the track, and I feel like a lower revving car wouldn't be as good as a car with a longer powerband

 

yes but you'll have to be able to make power threw it all. as technically you can rev a b18c1 to 9k or more(if you dissable the FC) but the power drops off after 7600 rpms plus you'r cause damage. See what im saying to achive that with what you're suggesting you'll NEED a cam and i'd be willing to bet bottom end work at least. don't know of any cammed "d" being able to hit 8K...and make power too. but im not very familier with the D-series. what's you'r budget for this car/engine build

 

well the d14a4 bottom end has a r/s ratio of 1.74 so i'm pretty sure it can rev too the moon, the only thing that I know that needs to be replaced on the bottom end is the rods since they're apparently pretty thin so custom rods will have to be in order to reach what I want. I don't really have a set limit fora budget? I just plan on buying things when I get the money, it's going to be a very slow build but I want to be dedicated to this because I've never heard of anyone in the US doing this before and I think it'd be pretty unique.
I think I'm going to have to get just the rods/crankshaft and not the complete bottom end since shipping a whole motor is 900+euros which is way too much for me and I'm hoping that it will fit in a jdm obd2 d15 block without too much modification
do you know what kind of head work would be needed to reach such rpm safely?

 

Springs,retainers,cam that's what i can think of off the bat. but i think most of the work will be needed on the bottom end. have you considred a B-series swap eassier more fun/potential.

 

Well I wanted to try and build a high revving D series that makes power at the top end because not many do it these days plus the learning experience would be awesome, but would a b16a2 swap be better? What would be needed to make the b16a2 rev/perform better at the top end? I want a higher revving motor so I can stay within the powerband. This video can explain more: Also what kind of engine do you have in your Integra?

 

b18>b16 more TQ. To get a b-series engine to rev into the 9.5K+ you'd need Short fat straight intake runners, large plenum, large throat, steep bottom cut on VJ, lightweight piston rod/combo, low tension rings,a Light weight rotating assembly with a heavy counter weighted crank. you can google this and find all you'r answers.

I've got a semi-build B18C1 in my teg.

 

i'm not sure I understand the point of this. you're gonna be spending a LOT of money for very little power, especially one that a stock gsr will easily run away from. at the end of the day, it'll still be a 1.4L.

 

it's unpopular because a mildly tuned B16 is pretty much what you're looking for. or just rebuild the Y8 and get a good transmission together with a shorter FD. to me it seems an overly ambitious project for someone with no set budget and maybe a misunderstanding of "powerband" and it's uses on track. not picking on you, just trying to be upfront and honest.

engines optimized to rev higher typically have narrow, "peak-y" powerbands. this is fine when you have the gearing to match keeping you in that powerband. but it will be "gutless" under normal driving conditions and that is annoying. what you want is useable torque centered around the range of RPM at which you spend most of your time.

weather you decide to go for it or no; set a goal, set a budget, set a deadline or prepare for heartache and disapointment.

 

hm alright I guess you guys are right. I'll have to think about this more and I'll probably end up with a B series instead because it just seems like a smarter choice thanks guys i'll be doing a lot more research