Yes and mazmart inspected one of them.
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Originally Posted by Brettus
(Post 4439061)
Totally stumped on that one . I originally (before tearing the engine apart ) thought it was the apex seals wobbling around in the groove and getting stuck .
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Originally Posted by Brettus
(Post 4438233)
I was leaning toward insufficient (stock) oil pressures as the wear looks similar to high mileage NA engines.
Thanks for the info... As I am reading through, I was going to ask you about Bearing wear, and whether or not you did any mods to the S1 Oil Pump or rear By Pass Valve, like talked about years ago and the Mazmart mod? Edit: Are you considering 'any' mods to OP. |
It was discussed earlier in the thread
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Originally Posted by j9fd3s
(Post 4440117)
are the tops of the apex seals flat? they shouldn't be. the old engines sometimes warp apex seals if they get too hot
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Originally Posted by shadycrew31
(Post 4440618)
do you mean the top where it meets the rotor face, or the top where it runs along the housing?
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Originally Posted by j9fd3s
(Post 4440688)
the sliding surface where it meets the rotor housing. the stock seals are crowned slightly.
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1 Attachment(s)
Originally Posted by shadycrew31
(Post 4440694)
Yeap they are round on the edges!
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Just to add a little more to the mix, we saw the same wear pattern on the side irons on our N/A race motors.
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sub'd
real informative thread! |
Originally Posted by j9fd3s
(Post 4440748)
its also crowned lengthwise too. pic is exaggerated, so you can see what i'm talking about
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Originally Posted by PhillipM
(Post 4440793)
Just to add a little more to the mix, we saw the same wear pattern on the side irons on our N/A race motors.
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1 Attachment(s)
In terms of balancing issues, the factory engine is fairly out of balance.
ive included the figures of my engine before and after being balanced |
Originally Posted by Brettus
(Post 4440892)
can you elaborate on this some more please . Ie was an omp used or premix ? How much use did they get ?Was any porting done in that area ? Was wear as bad as shown on mine ?
Engines were anywhere from 3k miles down to 200 miles... |
Where these engines balanced, new housing and new rotors?
What are the pros and cons of solid corner seals vs standard corner seals on these engines |
Originally Posted by PhillipM
(Post 4441039)
Some slight tidying on the ports but nothing massively extensive, premix was used, wear was similar to yours (~1mm). The nitriding seems fairly thin on '8 side irons so once it gets through the top bit it wears like lightning.
Engines were anywhere from 3k miles down to 200 miles... Did you ever eliminate the issue or find a way to reduce wear ? |
Originally Posted by ASH8
(Post 4440547)
Brett,
Thanks for the info... As I am reading through, I was going to ask you about Bearing wear, and whether or not you did any mods to the S1 Oil Pump or rear By Pass Valve, like talked about years ago and the Mazmart mod? Edit: Are you considering 'any' mods to OP. |
At high rpm you get shaft wobble if the motor is not balanced
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Originally Posted by Brettus
(Post 4441052)
That's really interesting . It seems to suggest the issue occurs when the engine is run hard enough to generate excess heat in that area rather than anything specifically to do with turbo backpressure .
Did you ever eliminate the issue or find a way to reduce wear ? |
doesnt excessive back pressure equal heat?
This side port exhaust is restrictive. did your corner seals look like this? http://www.pettitracing.com/wp-conte...ESIS-PORT3.jpg by the way what was that buildup in the rear iron cooling jacket? |
Originally Posted by olddragger
(Post 4441140)
d
by the way what was that buildup in the rear iron cooling jacket? |
Did you still have the tb coolant circulation intact? Or was it capped off?
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Yeah . Throttle body was blocked off .
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I do wonder if blocking that outlet somehow changes the way the coolant flows in that area?
What do you think? |
been a while but I remember someone posting about getting more detonation when the throttle body flow was plugged vs just bypassing the throttle body. Seems that it provides a specific cooling flow to the engine.
Also bypassing the TB isn't necessary, the heat from the coolant doesn't effect intake air temperature dramatically, but it does prevent your throttle body from icing up in the perfect wrong conditions. |
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