calculon

iTrader: (29)

I remember reading multiple threads some time ago (~years) pertaining to people complaining, legitimately, about JHBs horrible turnaround times.

I understand that they have a stock of parts coated already, and you send them yours as a core replacement. I also understand that if you'd like, you can get YOUR parts back, though the turnaround time leaves a lot to be desired, as mentioned above.

I was curious if anybody has dealt with them in any recent capacity and what their experience was like.

I'm not trying to start or stir any sh*t, just trying to gather information. I actually quite hope that I am at present misinformed in this regard.

Thanks.
ryan

rotaryinspired

iTrader: (3)

I can't tell you my experience was good last year.

calculon

iTrader: (29)

please share

monkhommey

does anyone know of an alternative to jhb?

rotaryinspired

iTrader: (3)

Yes just buy new housings.

I ordered a set of housings for S4 n/a and I was told were in stock when ordered. Payed in advance, full payment. It took over 2 months of me calling and badgering before they sent them. I received a bunch of run around info. This would have been ok if the motor was for myself, but I was building this on a time schedule for someone else, which was not achieved.

While the cerment B (cheaper of the 2) seemed good the housings it was sprayed on were not as great as I wished. There was pitting in the mating surfaces of the housing. While it was acceptable and there are no issues w/ the motor I would have preferred this not to happen.

You have to realize you will be paying for older housings that have been cleaned and refinished. I believe my total bill was close to $1000 which isn't worth it IMO. There is nothing wrong w/ the factory housings they will last well over 100K.

So to sum it up. After all was said and done waiting, paying customs, and so forth I could have bought new for $200 more and had well new housings. If you have ever built a motor w/ new housings there is no comparision to used ones on initial start up and compression.

calculon

iTrader: (29)

Thanks rotaryinspired. Unfortunately for me, I've got a C series 20B, so new side housings are a bit more pricey.

Any other experiences to corroborate his story?

monkhommey

... yeah read this..

https://www.rx7club.com/bad-fugly-members-185/jhb-performance-poor-quality-poor-communication-608589/

before you consider JHB.

i heard of an alternate to JHB and was wondering if any knew what the companies name was. i think someone got coated housings for about 300 for the pair. just curious.

Juiceh

iTrader: (4)

I think he was only talking about rotor housings. I don't think I've ever heard of JHB coating side housings, only rotor housings.

How would you compare JHB recoated housings to new housings on initial startup?

calculon

iTrader: (29)

They advertise them on their site (side housings that is) and have for as long as I can remember. They are primarily what I'm interested in since rotor housings are MUCH easier/cheaper to replace for my purposes..

I'm also curious as to the answer of Juiceh's second question.

misterstyx69

iTrader: (142)

ya..I remember reading On forum about the Bad job that JHB had done.after all the Big Bucks Spent on the Housings,they Looked like Crap!..I also read about the CERMET Stuff(good results)..NOW,I Kind of Remember a Place in the Toronto,Ontario area,that a Member was mentioning..it had to do with High temp Coatings,For Internals...It Eludes me right now.If you try going through a Search of JHB,particularly Posts in the Canadian Section of the Forum Last year,the info should be in there..I hope that May help you.Cheers Styx.

rotaryinspired

iTrader: (3)

My experience is that the JHB housings started up similar used rotor housings. A little harder to start. Motor mentioned had all new side seals and so forth. After it ran for a while and broke in the motor has been solid.

New housings have dull textured finish that helps w/ new apex seals. I am sure its more technical, but I am a simpleton. New rotor housings and seals (all around) seem to fire right up. No hard starts and so forth. This is the reasoning I alway want to use new housings if possible. Compression is just much better.

As for the side housings. I would not let a 20b center plate out of my eyes if possible. Would you hand someone $2500 and expect it to come back. I especially wouldn't send it to JHB.

Maybe someone can lap them for you?

calculon

iTrader: (29)

They aren't damaged right now luckily, I just wanted to do some research and start planning for the rebuild.

Thanks to everyone for your contribution, looks like JHB is officially off the table. Hopefully Glassman will get rolling pretty soon.

Juiceh

iTrader: (4)

Oops I meant I haven't heard of anyone getting coated plates from JHB.



I agree 100%. When my 20b is rebuilt I'm getting the plates lapped. Theres no way in hell I'd ever send them to JHB after some of the stuff I've read about them.

t-von

iTrader: (8)

Have you done a compression check to verify the difference in compression readings (new & used)? I reused housings from my 91 vert that had over 100k on them (one housing had previous apex seal damage on the exhaust side) and had 95psi cold start up compression while using really hard RA apex seals. Now I know that the jelly raises the compression a little, so I did another startup 30sec after the initial start-up and the engine fired right back up without any problems. The secret to having good start up compression is with your side seal to corner seal clearance.

rotaryinspired

iTrader: (3)

Yes there is a difference on start up. Did I check compression right after building w/ new housings, no. There was no point. All new parts w/in factory specs. They fire right up. All used rotor housing builds take a little more cranking. Compression always increases on used housings as you drive them the first 1k. I have not compression tested a motor w/ new housings to compare maybe I will. Just relaying what I have seen.

monkhommey

here..

http://www.nothingained.com/turblown...s/coatings.htm

darkphantom

iTrader: (2)

to resurrect this old thread, the engine we had and dyno'd lasted only 1 week after the tune! besides the fact that the coating in the engine came off by just wiping it down with my finger (as if it was sprayed on with a can of spray paint). and the rubber seals used on the rotor housings with sealing the motor werent even mazda parts, they were some wall mart rubber o ring, and he had the nerve to tell me to let the engine run and it will seal itself back. BULLS$*T we opened up the motor to find the rubber ring around the housing was bent over the housing itself!

the only good that came with it is that the turnaround time was ok!

monkhommey

well.. who did you have spray the housings? JHB or turblown (the link i added). since my last post in this thread i have talked to turblown about their engine coatings. they do not really recommend if for housings, the guy i talked to said that 10,000 miles is about all they see on the coated hosusings. and i believe the coating is a polymer, not a cermet. he did recommend them on the rotors tho and was claiming practically indefinate use and lower oil temps and better spool times due to less heat absorbed into the rotors.

darkphantom

iTrader: (2)

JHB! i still have the pictures to show proof, since he was so far he donated half of what i paid for but i still want my full refund back!

turboblown i would recommend, JHB it look as if he does it somewhere in his basement (tables with newspaper on them!

no matter how many coatings you put on them it will not last long, soon after the 10th oil change you will start to see the ceramic material in the oil!

JunpoweR

iTrader: (1)

FU*K JHB I remember someone in here offered me a set of these for trade on one of my 8 motors.Thank god I didn't!

t-von

iTrader: (8)

You should try some different wording because this is not true and misleading. Now by average yes but not "ALL". If properly built used housings don't need any more extended periods of time to fire up. There are more factors in determining how well a rebuilt engine will fire up than just the housings. My engine (with one badly scratched housing and brand new rock hard RA apex seals) fired right up as if it was already run in. Now break in did take several thousand miles.

rotaryinspired

iTrader: (3)

Glad yours fired right up. Yes there is a huge difference in compression using new parts. Of the 15 motors w/ used housings I have built this is what I see. I guess I don't know how to properly build one as you do by your wording since we are nit picking.

This coversation is like pissing in the wind.

I told you what I have seen take it for what it is.

t-von

iTrader: (8)

Your generalizing again without any hard data. You said so yourself, you haven't compression tested new housings with new parts but yet, there is a HUGE difference in compression? Again there are numerous other things that effect compression than just the housings. No need to get all upset. Just because I said properly built, doesn't mean I was talking about YOU and your past experiences. Also just because someone has rebuilt an engine X amount of times doesn't mean they do it right every time either. Side seal to corner seal clearance can play an even bigger role in compression. I know this because I've actually checked compression on the same engine with varying side seal to corner seal clearances. I've seen compression vary in ranges of 40psi.

rotaryinspired

iTrader: (3)

Again congrats. I don't care about arguing on the internet. I have more useful things to do.

t-von

iTrader: (8)

Again no one is arguing. I'm not looking for praise, just clearing up the misconception about used housings in relation to compression here on this thread. Peace!