Machine shop instructions for race prepping a crank?
03-13-2008, 12:19 PM
#16
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03-13-2008, 03:10 PM
#17
Were they all setup the same way? From what I understand, the EPC Valve is the better way to go for track use but you would have to select the correct pressure range valve and accumulator size for the application.
03-13-2008, 07:06 PM
#19
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I would cut the the counterweights a little send it to a serious crank shop and have that done and a good balance. Drill another oil in the rod journals at the outermost part of the throw so that the oil will come out of journal due to the forces exerted on it. I used to have have pictures on here but they've been long since deleted.
03-14-2008, 01:23 AM
#20
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03-14-2008, 11:25 AM
#21
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That means that anytime the oil pressure drops below that threshold the accusump will dump 3 quarts of oil in to the system – basically you crank will be going under the oil level as it spins. That can seriously aerate the oil – not good for the oiling system.
03-15-2008, 11:54 AM
#22
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Chris what do you mean by " your crank going under the oil level " are you saying it is better to have the Oil surge ?
Last edited by A.Wayne; 03-15-2008 at 12:14 PM.
03-15-2008, 02:29 PM
#24
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03-15-2008, 02:45 PM
#25
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LOL , every good race shop have a box of Bufferin 
for the suffering
Sounds like you bath tub need's a scraper and a baffle with a trap door
If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....and dry sumping is not a choice..
for the suffering If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....and dry sumping is not a choice..
Last edited by A.Wayne; 03-15-2008 at 04:36 PM.
03-15-2008, 04:15 PM
#26
LOL , every good race shop have a box of Bufferin for the suffering
Sounds like you bath tub need's a scraper and a baffle with a trap door
If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....
for the suffering Sounds like you bath tub need's a scraper and a baffle with a trap door
If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....
03-15-2008, 05:32 PM
#27
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LOL , every good race shop have a box of Bufferin for the suffering
Sounds like you bath tub need's a scraper and a baffle with a trap door
If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....and dry sumping is not a choice..
for the suffering Sounds like you bath tub need's a scraper and a baffle with a trap door
If you are describing cavitation , then i guess you are assuming all 3 qts will be discharged into the engine , this is not the case , oil is discharged until pressures are equalized , usually discharged amount is small as it is momentary, if you have the ecu activate the electronic valve it really covers all the bases for what it does .. not a replacement for dry sump as specified before , but it does help where surging is an issue....and dry sumping is not a choice..
03-15-2008, 09:14 PM
#28
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I was just pointing out a ‘worst case’ scenario – it is possible to dump all 3 quarts in to the engine and submerging the crank (not completely but a fair mount of the crank will below the sump oil level.
Once you aerate (foam) the oil it is difficult to get all the air out of the oil…and air is a pretty crappy lubricant!
In my mind the only thing an accusump will help with is the uncovering the pick up scenario – and if that happens then you have other issues that you should address. An accucsump will not help with aerated oil, pump cavatation or the crappy crank oiling passages.
On the plus side - It does make a nice preoiler!
Once you aerate (foam) the oil it is difficult to get all the air out of the oil…and air is a pretty crappy lubricant!
In my mind the only thing an accusump will help with is the uncovering the pick up scenario – and if that happens then you have other issues that you should address. An accucsump will not help with aerated oil, pump cavatation or the crappy crank oiling passages.
On the plus side - It does make a nice preoiler!
03-15-2008, 11:07 PM
#29
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hmph...I liked my translation better,
"He means the crank will go splash splash through the oil in a "3 year old in the bath tub without his ridalin" kind of way."
...but if you have to be SOOO technical!
BTW, If you get some time to send that spread sheet, I'd like to start getting my ducks in a row, or I could call you and we could discuss things. Just let me know the best time. I'm out the door for now.
E
"He means the crank will go splash splash through the oil in a "3 year old in the bath tub without his ridalin" kind of way."
...but if you have to be SOOO technical!
BTW, If you get some time to send that spread sheet, I'd like to start getting my ducks in a row, or I could call you and we could discuss things. Just let me know the best time. I'm out the door for now.
E
