for about 6 months, it is my only car and i drive around alot, and i drove it hard. i know it wasnt that long.
JDM 7m-gte
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If you buy a used motor you should always do a compression test as well as a good rebuild. Replacing things and spending a little extra money will save you a lot down the long run. You should check or replace things like the oil pump, water pump, headgasket, and all the other gaskets and hoses you can get to for that matter. If you go the cheapest route in getting your car up and running, well you get what you pay for.
The hard thing to tell with JDM motors is how many miles they have, what may be wrong with it, or how long it may have been sitting.
The hard thing to tell with JDM motors is how many miles they have, what may be wrong with it, or how long it may have been sitting.
ya i have an extra of everything so i will most likly be using alot of my extras. and i will buy a gasket set and do as many of the gaskets as i can.
againstdawall06 said:
I never want to tear this thing down again until it burns oil from age which i hope is many years down the road. I don't want to worry about the stock HG. A little bit of detonation or an overheat can kill them instantly too. Im not one to let that happen but you never know
I bought my Supra with a 55k JDM engine last winter when *it was still cold*. I came back from school and used it as my summer car. Within a week it was overheating so I changed the headgasket. OEM hg w/ ARPs @76 ft/lbs. I'm running about 10 psi, had it compression checked after I put on about 500 miles and compression was perfect. I think I'd agree with whoever said it was a hit or miss.
Definatley a hit or miss thing I bought a car from some guy who had a JDM and a bunch of Mods ( I'll never do that again!!). it ran strong as shit when I drove it test drive Within 6 months not firing in one cylinder, spitting out unburnt gas, alot of it. and ahhh pretty much my fault forf not compression testing it. Hit or miss mos def, just make sure to comp test.Dark006 said:
againstdawall06 said:
Thats not exactly what i meant .... have you ever looked at the cams of a car that has been well maintained and then looked at set that has not been you can tell the difference between the two you can see oil that looks like it has been cooked onto the cams and you can see sludge deposits. And the only way to get those things to look very clean it so take them apart and strip them. I honestly don't believe that they are going to go that far to make the motor look that good .... Also they are supposed to use a steph-a-scope to listen for rod knocks before they sell the motor
Agreed, definately get the HG and ARP's done BEFORE you install it. I made the mistake of not reading up much on the engines after I threw a rod on my first 7m and just had my mechanic throw the engine in. And nowwwwww, pretty sure I have a mild BHGJMDigital said:
My car's got a stock 50k JDM 7M with MHG and ARP's. Been pushing 15+ psi and 372+ rwhp for almost 2 years with great results. I also use the high-tech oil products I distribute which is also a contributing factor to avoiding oiling problems and rod knock.
When I say "hamstrung" I mean I ordered the engine once my mechanic said he could put it in. It took him an additional 42 days to install it (Up until that point he'd always been on the ball) This was part of the process that screwed me. UPon start up my JDM MotherF#cking engine already had # 1and #6 cylinders blown and some how had a rear exhaust side valve snapped off and mashing into the head and piston face..........I should have fixed the spun bearing.
42 days?!Wendigo said:
my mechanic took my old one out, and threw my new JDM in in 3 days.
:aigo:
when a machine shop mills the block and head for a MHG, do the internals have to be removed? do and of the goofy stuff hanging on the block even have to be removed?
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againstdawall06 said:
Yes, the whole bottom end has to be disassembled to surface the deck. I would also recommend you at least resize the rods and use ARP rod bolts, hone the cylinders, and install a new set of bearings and rings.
You would be supprised how bad most of those "low milage" jdm longblocks look inside. Unless your old motor is unrebuildable you would be better off rebuilding it in most cases. The cost of the jdm motor alone would pay for much of the rebuild on your old motor.
all my internals are pretty much shot, it would cost me around $3000 to rebuild it, which is money i dont have. so im thinking the JDM motor would be best since i have the money to buy it, but i havent made my final decision yet.
againstdawall06 said:
I've been there myself, and it's not an easy decision when money is tight.
Keep in mind that there is a chance the JDM engine could also have problems, and you will have even less money after purchasing it.
I've had several JDM Engines in the past. They're a cheap alternative for a rebuild when your current engine is shot. I got my last one from JDM Imports for $950 shipped. It was in pretty decent shape. There was a fair amount of wear and pitting on several cylinder walls, and 8 of the valves needed replaced, the rest was fine. I'd hate to see the short lifespan this thing would of had if I just installed it without tearing it down first.
I WOULD NEVER JUST DROP IN A JDM ENGINE. Even if it only has 15k mi on it, it's most likely been sitting around for 10+ years. All belts, hoses, and gaskets are going to be pretty shot. Sure it'll last for a little while if you drop it right in, but you'll just end up damaging it in the long run.
If you plan on pushing the engine with performance enhancements, a complete teardown is a must IMO.
I WOULD NEVER JUST DROP IN A JDM ENGINE. Even if it only has 15k mi on it, it's most likely been sitting around for 10+ years. All belts, hoses, and gaskets are going to be pretty shot. Sure it'll last for a little while if you drop it right in, but you'll just end up damaging it in the long run.
If you plan on pushing the engine with performance enhancements, a complete teardown is a must IMO.
I have also tried a jdm 7m. When I got it, I plastigaged the the bottom end and all was good. When checking the head I found 4 intake valves stuck open.I called the people I bought the engine from to see about another engine. Really I wanted to see if they would take care of the problem if there was one, he agreed they would.
So I pulled the head, found the block to be cracked, called the guy, he said he didn't believe me, so I sent pics. I called again and he said my warranty was void because I pulled the head. Fuck.
.0On the plus side the head (the only thing I used) was in great shape after cleaning the heavy varnish, but an $1100 head should be. That was my experience with a jdm 7m.
Good luck to you, keep your fingers crossed and buy a rabbits foot.
I'm rebuilding the the engine that was in the car btw. It sure help to have another daily driver.
So I pulled the head, found the block to be cracked, called the guy, he said he didn't believe me, so I sent pics. I called again and he said my warranty was void because I pulled the head. Fuck.
.0On the plus side the head (the only thing I used) was in great shape after cleaning the heavy varnish, but an $1100 head should be. That was my experience with a jdm 7m.
Good luck to you, keep your fingers crossed and buy a rabbits foot.
I'm rebuilding the the engine that was in the car btw. It sure help to have another daily driver.
I bought one and beat the crap out of it for the past two years and no problem yet. Running 14psi
YoNkErS87t said:
Thats what i am saying :evil2: the weakest link is the owner not the motor hahahaha change the oil pump and check ya oil levels
Hey Againstdawall, Hows it going, I think your the guy I gave my old accordion hose to on the River Road Cruise. One of you guys?
I'm kinda in the same boat. My car has had intermittent slight BHG for the last 2 years that I never could actually confirm until now. I have no idea what the previous owner did to the car, only that the Heads @ 85lbs and the coolant res. is stained from a previous bad BHG. My car is not my DD or even close but I have been fighting my way through allot of "classic" mk3 issues since I got the car, and of course the biggest hurdle of progress has been my wife's financial intelligence. I cleared all my issues and the car has been running smooth and strong for the last 2 months. Then all of the sudden my BHG symptoms got worse and I finally failed a block test, a little bit of oil smell in the coolant as well now. My internals are pretty damn rough looking. They have had a hard last 2 years and god only knows what before me.
I cannot for the life of me make up my mind. JDM+tweaking or rebuilding my 7m. I have been leaning toward the JDM route from a source out of Canada for around 900 shipped. They told me a good harness can be arranged and of course the Compression test. Not to mention all the extra components. Maybe we could go-in on a pair and cut the shipping down? Where or have you looked @ sourcing from?
~ James
I'm kinda in the same boat. My car has had intermittent slight BHG for the last 2 years that I never could actually confirm until now. I have no idea what the previous owner did to the car, only that the Heads @ 85lbs and the coolant res. is stained from a previous bad BHG. My car is not my DD or even close but I have been fighting my way through allot of "classic" mk3 issues since I got the car, and of course the biggest hurdle of progress has been my wife's financial intelligence. I cleared all my issues and the car has been running smooth and strong for the last 2 months. Then all of the sudden my BHG symptoms got worse and I finally failed a block test, a little bit of oil smell in the coolant as well now. My internals are pretty damn rough looking. They have had a hard last 2 years and god only knows what before me.
I cannot for the life of me make up my mind. JDM+tweaking or rebuilding my 7m. I have been leaning toward the JDM route from a source out of Canada for around 900 shipped. They told me a good harness can be arranged and of course the Compression test. Not to mention all the extra components. Maybe we could go-in on a pair and cut the shipping down? Where or have you looked @ sourcing from?
~ James
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