So here I am starting to look for a JDM 10:1 engine for my NX and no one knows how to tell the difference between the 9.5s and 10s (maybe using a rod to measure piston top through the spark plug hole?). Ok, now if all these importers "compression test" every engine, then doesn't it make sense that they would know which ones are the high compression engines? Input blokes... I'm looking for your thoughts... yes, I know the sky is blue... I'm looking for thoughts and info about the engines. :)

Cossie

Hey ehats up its Andreas Miko. I live in Miami. If you call me at 305-282-3643 I will be able to help you.

Andreas Miko.

Originally posted by cossieturbo
So here I am starting to look for a JDM 10:1 engine for my NX and no one knows how to tell the difference between the 9.5s and 10s (maybe using a rod to measure piston top through the spark plug hole?). Ok, now if all these importers "compression test" every engine, then doesn't it make sense that they would know which ones are the high compression engines? Input blokes... I'm looking for your thoughts... yes, I know the sky is blue... I'm looking for thoughts and info about the engines. :)

Cossie

I was told three years ago buy a few prominent list members that only the 10:1 engines come with the tubular OEM steel header instead of a cast aluminum exhaust manifold.

Supposedly you can look into the plug hole to see if it has flat pistons (10:1) or dome pistons, but I couldnt even with a flashlight.

That is a false statement. It does not have to be 10 to 1 if it came with a tubular manifold.

145hp 10 to 1 motor.
150hp 10 to 1 motor with tubular manifod.
145hp 9.5 to 1 motor with tubular manifold.

Most likely if you find a 10:1 motor it is going to be a UK motor with a 96K highport stamp on the head or 89K lowport stamp on the head and the 10:1's have red valve covers and all NA JDM SR20DE engine have steel tubular headers.

Well Charlie2020 you are right about the UK motors and the # stampings on them. You are wrong about the JDM motors all coming with the tubular manifolds. Most of them actually come without tubular manifolds. A little later on I will share my knowlegde about telling how you can find a 10 to 1 motors just from a quick glance from the out side.

Originally posted by charlie2020
and the 10:1's have red valve covers

Isnt it just the DETs that come with the red vc?

Originally posted by Andreas Miko
Well Charlie2020 you are right about the UK motors and the # stampings on them. You are wrong about the JDM motors all coming with the tubular manifolds. Most of them actually come without tubular manifolds. A little later on I will share my knowlegde about telling how you can find a 10 to 1 motors just from a quick glance from the out side.

That's cool it's just that I have never seen a JDM SR20DE with a non tubular steel manifold, the engine importer down here buy my house must of had at least 50 JDM SR20DE's and all had the long style tubular exhaust manifold and I realy doubt all of them were 10:1, for one the 10:1's come from the Nissan Primera GT and a select few other Sunny's mostly UK models all though there was 1 red top UK SR20DE which has grey fuel injectors which look the same as the 300ZX injectors and no it wasn't a Bluebird red top for it was not tapped for oil return and did not have the water line either and it had the same style tubular manifold as the other JDM SR20DE's, the only difference is the UK motor came with a MITSUBISHI alternator the more expensive one from NISSAN and a red valve cover just like the Bluebird an all the other 50 or so motors that were non red top had the more common HITACHI alternator. I know this because I went there to get a used alternator and I took the MITSUBISHI one off the UK SR20DE and and gave him $25.00 for it. The only other thing I can think is the SR18DE that has a cast iron ugly ass manifold.

PLEASE DO SO BECAUSE I WOULD LIKE TO KNOW FOR SURE.

A little later on I will share my knowlegde about telling how you can find a 10 to 1 motors just from a quick glance from the out side. [/B][/QUOTE]

Originally posted by Fast91SER


Isnt it just the DETs that come with the red vc?

HIGHPORTS
No, some SR20DE's come with red valve covers, mostly and only the ones I have seen are from the UK with grey fuel injector and MITSUBISHI alternators.


LOWPORT'S
NOTE: There are 10:1's out there without red valve covers and those are from the newer Primera GT's and they are lowport heads with roller rocker arm's and some with 4 counter weight crank shafts with black valve covers.

LOWPORT
Primera GT 1996-99 Engine specifications
Engine 1998cc 4cyl DOHC 16valve
Engine model SR20DE
Maximum power 150 bhp (110kW) @ 6100rpm
Maximum torque 134 lb/ft (182Nm) @ 4800rpm
Compression ratio 10:1
Top speed 136mph
0-62mph (0-100kmh) 8.7 seconds
Fuel type Premium Unleaded (95 octane)
Fuel consumption 33.6 mpg (combined)

LOWPORT
Primera non GT 1996-99 Engine specifications
Engine 1998cc 4cyl DOHC 16valve
Engine model SR20De (NOTE: De)
Maximum power 130 bhp (96kW) @ 5800rpm
Maximum torque 125 lb/ft (170Nm) @ 4800rpm
Compression ratio 10:1
Top speed 127mph
0-62mph (0-100kmh) 9.6 seconds
Fuel type Premium Unleaded (95 octane)
Fuel consumption 33.6 mpg (combined)

My head hurts.

Ive always been suspicious of the header bieng a dead giveaway, but Ive never been told otherwise.

Seriously, I got JWT's 10:1 program when I did my engine, and Ive been reluctant to turbo because of this.

I would like a definitive answer, also.

If I have a 9.5:1, and am running the 10:1 program, am I causing any ill effects?

As for the number of 10:1 units, last time I was in Japan, Primera GTs were like cockroaches, they were everywhere. There didn't seem to be any kind of limited edition run of those.

And my head spins round and round and... =) Andre, i'll call you some time this week. I know we have spoken before, but I have been sinking all of my cash into my house (which I must now sell) so that's why I have not gotten back to you. My engines starting to get a bit tired (109,000 miles) so I though I would start learning before I dump money out and when my house sells, that will also help.
So what I see now is it's a bugger to tell which is a 10:1. :rolleyes: It's only getting easier, riiiiight. Time to find a nice 2000 or 2001 Impreza RS. Oops, did I say that? ;) Thanks blokes for your input. One day, 10:1.

Cossie

Im waiting to find out too cause I also am worried about my JWT programming...Im also running stock cams on an S4 program so I dunno..... prolly why Im not hittin them 10's LoL

this is bothering me too. Please tell how to tell by looking at the outside. please please please

Well I was talking with this bloke I know and he reminded me of the old days with the Bimmers. We use to use a thin coat hanger to feel the piston surface. I had forgotten this tech. I just posted about it in another thread/forum.
http://www.sr20deforum.com/showthread.php?s=&threadid=20712&perpage=20&pagenumber=3
This really seams like the only way to tell. Wish it were easier.

Cossie

if you look near the oil pump and there is the number "5562" stamped there it is a 10:1 engine.


just kidding. maybe it has something to do with color of the valvecover in the area near the plugwires.

if anyone runs across one of those cast alluminum exhaust manifolds mentioned earlier id sure like to see it!!!

Hey the thing about the number by the oil pump wasn't funny, just kidding. Yeah I have been in the other thread regarding this and ***** knows. My problem is That I just got my JDM motor put in my car and my ECM is on order( for four weeks now) from JWT. The guy at JWT says that my motor is 10:1 cause of the long tubular exhaust manifold. I am lost and don't know what to do. Also my JDM motor has black injectors, has anyone ever seen black ones. The fuel rail on the motor was bent so I swapped the whole thing and I am using the red injectors from my old motor. My car is running extremely rich now. But The same guy at JWT said that if you have the wrong program for the ECM that it would run rich. So now I am tired of typing and the car will stay in the garage untouched till I get my ECM.

were the black injectors the rare 444cc or were they purple? Hmmmmm. What kicks my arse is it's cheaper to buy a thin light scope and look through the spark plug hole then it is to lift the head. I had some more ideas. Posted them in the other forum.
http://www.sr20deforum.com/showthread.php?s=&threadid=20712&perpage=20&pagenumber=3

Cossie

Yeah I saw the other Ideas and had already tried them, I was the guy you responded too. I am just going to wait on the computer, still wondering about the injectors though.

Originally posted by Andreas Miko
Well Charlie2020 you are right about the UK motors and the # stampings on them. You are wrong about the JDM motors all coming with the tubular manifolds. Most of them actually come without tubular manifolds. A little later on I will share my knowlegde about telling how you can find a 10 to 1 motors just from a quick glance from the out side.

Come on, tell us, im dying to know which one I've got :D