i have the oppertunity to pick up a

86 mm darton sleeved LS complete with pro drive oil pump gear

i was gonna use this for my summer cruiser and i have read that a lot of u guys think 86 is for race only

i think there were a couple of guys running around that daily drive their 86 mm bore B series motors.

have u guys had any trouble ? i hear the head gasket is a weak link as well as if the cyclinder gets scored u are pretty much **** outta luck.

inlinepro seems to have the 86 mm bore on a street car down packed

https://honda-tech.com/zerothread?id=1092076

this will be teamed up with a ported it-r head and valvetrain
i already have 1 mm oversized intake valves
unsure about cams maybe rocket motorsports if they do not have any issues with oversized valves making contact i will have to have the cam degreed

and i was planning on running 12.0 : 1 compression
LS knifed crank , and maybe IB spec rods and maybe ib spec wiseco pistons

so please let me here any info u have on a 86 mm bore for a street car because i am really interested in this block and the power it could make

thanks

 

I wouldn't recommed it. Obviously, you will need aftermarket forged pistons, which means the motors tolerance for error will be extremely tight and determined mainly through tuning. One thing's for sure, get rid of that oil pump setup and go to an oem P72 pump.

 

it does have pistons but the cr will be too high

so i will have to get 12:0 :1

whats wrong with the pro drive oil pump gear?

no one has a 86 mm motor on the streets ????

 

Are you going to be getting a really good deal on it? Its an assembled bottom end is that right? It almost seems hit or miss if it will last or not--one thing is for sure though, any detonation or tune problems and you will have a good chance of having HG issues. Also, you really can't reliably go up in bore size--say if you have a problem down the road. Not identical, but I had a 79mm d16a6--I would NEVER do that again--78mm is fine--its the same with b-series--there just isn't enough material for a street motor. Alot of these motors are drag motors--totally different application. I can assure you there aren't many (if any) b series 86mm road racing motors!!

 

I view it as the type of thing where you are trying to push the limits. Like if you have alot of money and don't mind pulling the motor in and out--to see what you can get away with weather its compression or extreme bore size. That is R&D. But for a guy who just wants to drop the motor in, have a fast fun car, and not have to worry about blowing it if the outside temp. goes over 95 degrees it seems like its too much of a hassle.

 

well yah it is out of a race car and i am getting a nice deal on it

and i do want a nice street / strip circuit motor to beat on.

i did a LS vtec but it has been giving me so many issues that i wanna go 2.0 L ( this bottom end i know is bigger than 2.0L )

but for the price i was getting it for it would be close to me going out and buying a b20 then pistons , assembly and rods and all the other BS just to get it ready i would be close to the privce of this bottom end.

but a 79 mm d16a wow how did that run?

how was it on the street must have been a monster

u have a thread on it ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by strict 9 ef &raquo;</TD></TR><TR><TD CLASS="quote">
whats wrong with the pro drive oil pump gear?
</TD></TR></TABLE>

https://honda-tech.com/zerothread?id=918319
https://honda-tech.com/zerothread?id=963366

 

oh **** thanks a lot bam bam

 

I'm checking my Darton book and it says DRAG ONLY in rather large letters for the 86-87mm bore M.I.D. Kit's, so it will be hit or miss if it will like extended street use. As others before me have said, it's all in the tune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by strict 9 ef &raquo;</TD></TR><TR><TD CLASS="quote">oh **** thanks a lot bam bam </TD></TR></TABLE>

Some people have had luck with them and not shattered them. Some people have also shattered stock ones. But more often than not, stock has just done fine. One thing is for sure, DON'T run an aftermarket crank pulley or CTR one. Stock is just fine.
I only have experience with the OEM P72 oil pump and have never experience problems. Alot of people also swear by the Toda oil pump setup. It's your call; just trying to look out for you.

 

86mm build is do-able, but you're really pushing the HG limit. It'll be nice if it run right thought.

 

Literally, the third or fourth time I really leaned on the 79mm motor--took it over 6000--it cracked the surrounding aluminum of the sleeve. The tune and timing were actually conservative and running straight 100 octane, the compression was too much for a thin sleeve--it was around 13:1. It was a JG sleeve--and JG kept the surrounding aluminum and just inserted a thicker iron sleeve, but at 79mm the iron was very thin so it actually cracked the aluminum (from flexing) between 1 and 2 cylinders and started pushing water out of the HG with a commesurate drop in compression on the cylinder--I had some other bad problems with it--the 75.5mm motor that I am running now with same cam and headwork (only a bit less compression 12:1) is probably just as quick due to a better break in and better ring seal from the bores flexing less. I am doing a 78mm a6 though. Is that 86mm a JG block? I remember there is someone selling an 86mm JG block, and you can see that the sleeve thickness is SO thin, so a block guard had to have been used.

 

yah bam bam i think u have persuaded me for sure about th epro drive one plus the company seems to have lots of broken parts

the block is actually done by a small machinist in canada that has lots of fast all motor cars

his work is very good.

i am really torn right now.

it will be tuned by one of the fastest all motor guys here in toronto so the tune is not really something i am worried about as he has a 86mm race motor.

any one know of any of the inline pro guys that have these street motors.

like d16dcoe45 i am looking for ppl that have had some experience with a high strung motor

plus there is a GE sleeved 86 for sale too

plus keep in mind i am not running that crazy of a cf ratio too 12.0 :1