Engine teardown - 300+ hp with highish miles
#102
are the tops of the apex seals flat? they shouldn't be. the old engines sometimes warp apex seals if they get too hot
#103
Super Moderator
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.
#106
#108
#114
Engines were anywhere from 3k miles down to 200 miles...
#116
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...
Engines were anywhere from 3k miles down to 200 miles...
Did you ever eliminate the issue or find a way to reduce wear ?
#119
Nah, I ran out of spare engines and money first and sold up
#120
Registered
iTrader: (3)
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?
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?
Last edited by olddragger; 03-16-2013 at 09:06 AM.
#125
Registered
iTrader: (3)
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.
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.