Compression testing
#1
No rotary, no problems?
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Compression testing
Alright, so I'm starting to go more in depth about compression tests on a 7, and I'm wondering what a "good" "bad" and "excellent" range are for compression numbers. If I remember right, 120 is brand new, and 80 is about shot. A couple of cars I've been told have 85 compression, and the mechanic has said that the seals are worn, but would last another 5 years if it's driven lightly. I want a 7 that I can build up and make fast, but I'm thinking if I give a rotary engine with that crappy of seals some abuse, it's gonna blow pretty quickly. So what are your guy's thoughts here? Is this car gonna hold up?
#2
I live in an igloo
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Personally IMO it goes like this
120 -new
100 -excellent
80 - Worn
70-60 - on the verge
If you want a seven that you want to 'build up fast' my advice to you is buy a blown engine and get it rebuilt. If you want to really top it off, you can buy new housings, or to give yourself the luxury of a brand new engine, buy it all. If you do that, your looking at 4-5grand US im sure aka not worth it.
Personally, if Im getting a rebuild, I'll save for it and get myself some new FD housings. Machine the rest if its still good and have it rebuilt by dan or kevin.
This just gaurentee's that your going to have an engine thats going to live a long while if you take care of it.
120 -new
100 -excellent
80 - Worn
70-60 - on the verge
If you want a seven that you want to 'build up fast' my advice to you is buy a blown engine and get it rebuilt. If you want to really top it off, you can buy new housings, or to give yourself the luxury of a brand new engine, buy it all. If you do that, your looking at 4-5grand US im sure aka not worth it.
Personally, if Im getting a rebuild, I'll save for it and get myself some new FD housings. Machine the rest if its still good and have it rebuilt by dan or kevin.
This just gaurentee's that your going to have an engine thats going to live a long while if you take care of it.
#5
No rotary, no problems?
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Buying a new engine is definitely outta the question. Any clue on how hard it would be to replace the seals on the engine if it turns out that's all that's wrong? Definitely good to know what I'd be looking at on engine life with that car. 85 compression definitely ain't gonna get me many runs down the track, or even some miles to put on the car. How much do rebuilt engines usually cost for the engine and labor? How hard is it to put a rebuilt engine in yourself? Thanks for the info guys.
#7
Engine, Not Motor
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Originally Posted by Ice_Wolf
Any help here guys?
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#9
Rotary Enthusiast
MAN nothin ever changes in HI-PERFORMANCE vehicles, how fast do you want to go, how much do you want to spend, money cures all man related problems. just a note.
#10
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Just so you know, a lower compression engine can survive for a while. My 88 TII had 75ish psi on the rear rotor, 80psi on the front at 174,500miles. Now I'm almost to 178,000 and it still pulls hard.
I will be rebuilding it over the next couple weeks, however.
I will be rebuilding it over the next couple weeks, however.
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