how long will t last on 60 psi compression
#1
boosted fc
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how long will t last on 60 psi compression
any one go an idea of about how long my engine will last. it has 155k miles and only has 60 psi compressio on front and rear roto and it is an s5 na
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i figured that. i used a regular piston type comprssion tester and it was 3 evern bounces of 60 psi on both rotors. it starts and runs fine so far but i only have about half thmoney to rebuild it thats why im asking
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#10
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were could you get the gaskets to build it for 200 th chepest i could find was 800 or more and that was with out apex seals and if i did it or 200 could i drive it hard or just get from a to b
#11
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do it now, and you can get by on probably 600, but I would do a tad more and replace oil and coolant seals while you're in there. Do it right and get another 155k out of it. Congrats, that's the second highest mileage I've seen a rotary last (although I'm sure there are others out there)
#14
My job is to blow **** up
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http://rotaryaviation.com/o-ring_kits.htm171 SHIPPED.
i can get apex seals locally cheap, and housings for next to nothing , but it's all 100k plus mile stuff, except the seals are all 7.8-.0mm.
Check
Check
Failed to see Rotor housings on this list, which will be require for more then about 100k on already 155k miles housings, which is exactly the reason for a cheap rebuild.
i can get apex seals locally cheap, and housings for next to nothing , but it's all 100k plus mile stuff, except the seals are all 7.8-.0mm.
Check
Check
Failed to see Rotor housings on this list, which will be require for more then about 100k on already 155k miles housings, which is exactly the reason for a cheap rebuild.
#15
My job is to blow **** up
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i would drive it like normal, rev the **** out of it, but dont let it over heat.
This is AFTER i see the housings on the inside FIRST, before i ever tare down the block. you need to make sure an apex seal hasnt damaged the housing super badly, i had a motor with 165k miles, 115 psi compression. and the apex seals were right at 6.52, so maybe had 2k miles left on them..but the motor needed a new coolant seal. now they've got about 26k more with new(used) apex seals.
#16
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There are two things to do when you're using a piston tester. When you do the part that you did, you are *only* looking for 3 even sweeps/bounces. You are not using the height of those bounces to measure the compression because the schraeder valve is venting the whole time.
The second part is to crank with that valve closed. That's when you're judging compression.
Did you do part two, or are you going solely by part one? If you only did part one, all you can say right now is that things are looking good.
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http://rotaryaviation.com/o-ring_kits.htm171 SHIPPED.
Failed to see Rotor housings on this list, which will be require for more then about 100k on already 155k miles housings, which is exactly the reason for a cheap rebuild.
Failed to see Rotor housings on this list, which will be require for more then about 100k on already 155k miles housings, which is exactly the reason for a cheap rebuild.
#18
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Um, back up a second here.
There are two things to do when you're using a piston tester. When you do the part that you did, you are *only* looking for 3 even sweeps/bounces. You are not using the height of those bounces to measure the compression because the schraeder valve is venting the whole time.
The second part is to crank with that valve closed. That's when you're judging compression.
Did you do part two, or are you going solely by part one? If you only did part one, all you can say right now is that things are looking good.
There are two things to do when you're using a piston tester. When you do the part that you did, you are *only* looking for 3 even sweeps/bounces. You are not using the height of those bounces to measure the compression because the schraeder valve is venting the whole time.
The second part is to crank with that valve closed. That's when you're judging compression.
Did you do part two, or are you going solely by part one? If you only did part one, all you can say right now is that things are looking good.
To the OP report back to us with a comp test with the valves installed/closed. I know my S4 n/a engine is STRONG and i only did a comp test with the valve open getting 60+PSI. If you aren't having any starting issues or smoke issues i'd assume the core is good.
P.S I laughed pretty hard at the $200 rebuild.
#20
Sharp Claws
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why do noobs say this? low compression does not mean an engine is going to blow up, it simply means your housings and seals are probably worn and it will just continue to become more difficult to start as compression gets lower.
you can't. there is no such thing as a "budget rebuild" on an engine that has that low of compression and worn apex seals. i do suspect you used the gauge wrong though since it would be near impossible to start an engine reliably that only has 60PSI of compression.
you can't. there is no such thing as a "budget rebuild" on an engine that has that low of compression and worn apex seals. i do suspect you used the gauge wrong though since it would be near impossible to start an engine reliably that only has 60PSI of compression.
#21
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i dont know if the gauge is wrong or not but when i didnt pull the valve it didnt build mo than 60 psi and wen it was bouncing it hit 55 o 60 all three times
it my daily and ther only car i have now thats only reason im nervous about it
it my daily and ther only car i have now thats only reason im nervous about it
#22
rotors excite me
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You have to leave the valve closed to get the near true compression. The bounce test is only to show how even the comparative compression is between rotor faces. You could have a motor that's actually holding 100psi+ compression. http://rotaryresurrection.com/2ndgen...ion_check.html
#23
Cake or Death?
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Seems to me that you have two immediate options:
- If it does in fact "drive fine", just keep driving it until it doesn't.
My NA had 80psi when I bought it three years ago but ran- and continues to run- quite well. Never floods or fails to start, gets reasonable gas mileage...seems fine.
I've put over 50K miles on her since then (she's my only car, too) and have had zero engine related problems.
-Start proactively planning for an engine swap.
By "swap" I mean either another rebuilt NA, a turbo conversion or a different engine altogether.
You'll have to decide which path makes the most sense for you, my thinking tends towards either a rebuilt NA or a V-8, the turbo is really not a viable option IMO.
Option one is obviously the riskiest but unless the engine just decides to pop- always a possibility- you should have fair warning that things are really beginning to deteriorate.
Option two is the smartest but requires that you immediately start spending money acquiring parts. Giving yourself a few months to get ready means that you can shop around and not jump on whatever happens to be available right then.
Either way, good luck.
#24
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i want to rebuild with a street port, and i also i have never rebuilt a rotary i have done practicley everytihng else but rebuilt one, or i can find one thats already been rebuilt that can afford i will do that and it woul be easier for me because it is my daily andi could swap it in a day