Sleeved engine project pics
06-23-2007, 01:46 PM
#76
Former Sponsor
Very nice stuff. Man jewelry. Your project is impressive.
gb
gb
06-27-2007, 08:06 PM
#77
Three Wheelin'
Thread Starter
Thanks Greg!
Sterling, yes the clamping force and tightening sequence is different. I tested some studs to their yeild point to establish the tightening sequence and here's how it came out:
Lower case half M10 studs-15 ft/lb + 112 degrees. That works out to be about 55-60 ft/lbs if a torque wrench were used which is higher than the 37+4 stock spec.
M12 head and main studs-25 ft/lb + 142 degrees. That seems to be about 95-100 ft/lbs which is quite a bit more than stock. A stock main spec is 55+4.
Higher clamping force wasn't the reason for these studs, even load stretching was. Higher clamping force carries the risk of pulled threads, if these were an aftermarket solid body type with that kind of clamping force I'd worry about the block threads.
For curiosity sake, does anyone know the story with stock head bolts and studs? The manual lists torque angles of 90+90+90 for studs and 90+90 for "hexagon bolts". 270 degrees seems like alot, are they TTY or just very flexible? Mine would yeild at 190 degrees.
Sterling, yes the clamping force and tightening sequence is different. I tested some studs to their yeild point to establish the tightening sequence and here's how it came out:
Lower case half M10 studs-15 ft/lb + 112 degrees. That works out to be about 55-60 ft/lbs if a torque wrench were used which is higher than the 37+4 stock spec.
M12 head and main studs-25 ft/lb + 142 degrees. That seems to be about 95-100 ft/lbs which is quite a bit more than stock. A stock main spec is 55+4.
Higher clamping force wasn't the reason for these studs, even load stretching was. Higher clamping force carries the risk of pulled threads, if these were an aftermarket solid body type with that kind of clamping force I'd worry about the block threads.
For curiosity sake, does anyone know the story with stock head bolts and studs? The manual lists torque angles of 90+90+90 for studs and 90+90 for "hexagon bolts". 270 degrees seems like alot, are they TTY or just very flexible? Mine would yeild at 190 degrees.
06-27-2007, 09:02 PM
#78
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Mike, very nice work! I have a machine shop also, so i know what went into your project...whew! Just out of curiousity, what did you use for an expansion rate on the block, heads and girdle? I know the rate is different for hypereutectic alloy like the block, but can't remember what it was... I presume you allowed for this in your torque values, eh?
cool beans, man...
Steve
cool beans, man...
Steve
06-28-2007, 12:02 AM
#80
Three Wheelin'
Thread Starter
Steve, the differences in expansion rates between the steel and aluminum is equal to approximately 1/4 of the clamping stretch of the longest head studs over a 230 degree F range. Actually it's different because my sleeves are also steel and the studs anchor near their base so I'll have the outer block walls doing funky things while the head stud/cylinder relationship is stable. If I have the head gaskets leaking coolant when cold than I'll suspect this. The CTE number I used is "20" whereas a normal aluminum value is 23.
Abby, good question. I used Megasquirt in the past and could easily do it again but I'd like to use a more refined ECU this time. VEMS is very appealing, it seems to be what MS should have become but I'm not familiar with it. Whatever I do I'll wait until the last minute to buy the ECU itself so that I get the latest stuff.
Abby, good question. I used Megasquirt in the past and could easily do it again but I'd like to use a more refined ECU this time. VEMS is very appealing, it seems to be what MS should have become but I'm not familiar with it. Whatever I do I'll wait until the last minute to buy the ECU itself so that I get the latest stuff.
06-28-2007, 12:15 PM
#81
I'm going to use VEMS mike, and the support is much more there now. Waiting until the last minute is the best plan. www.vems.co.uk/forum/
07-31-2009, 01:38 AM
#83
Administrator - "Tyson"
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I sent Mike a PM to get on here and share some details!!!
07-31-2009, 03:57 AM
#85
Former Sponsor
Very impressive. Very nice work! Your stuff is just "art". Hope it runs to your expectations.
07-31-2009, 08:18 AM
#86
Craic Head
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Just saw this thread for the first time. I'm really interested to see what the dyno numbers came out to.
Great thread! Thanks for posting all the details and pics for us spectators and engine build wannabes!
Great thread! Thanks for posting all the details and pics for us spectators and engine build wannabes!
07-31-2009, 09:04 AM
#87
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07-31-2009, 09:30 AM
#88
Craic Head
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