Stroking a Reverse Rotation 454
01-10-2011, 04:50 PM
#21
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Sounds like an inboard to me. A reverse rotation motor will spin the motor's crank backward. The 72's, you have to rotate the plate that is in the front of the tranny to make it work like a normal rotation tranny would but spinning in the other direction.
01-10-2011, 06:51 PM
#22
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Fastestonehere I know your boat well.
I'm vey interested in what you're at doing because I'm looking to do the same thing on a 21000 lbs boat . First, do you have Crusader engines?
The reason being is You said that you have "2 454 MK IV,s one standard rotation one Reverse rotation "crank spins backwards" cam is standard direction reverse firing order "gear driven" -
Are you saying saying that your cam is a standard cam and not a reverse cam in the reverse engine? I was thinking I would have to get a special reverse grind cam on mine, but if it's standard cam that would be great.
I was hoping to use a mild cam that would utilize the added stroke to acheive about 400 to 420 hp and 500 lbs of torque in the crusing range. With our type of boats its all about torque, so any way I could acheive more of it that would be better. I also run 72c transmisions. As far as propping I deal with prop scan out of Chichago, they are excellant. With my boat I was hoping to get a couple more inches of pitch with the added torque and then cruise at a higher rpm. I use fuel flow meters and know that if I currently run at 3500 rpms I get better fuel ecoonomy than at 3200. I was hoping to run the rebuilt stroked engines at 3800 because despite the higher rpms the more the boat gets up out of the water the more efficient it becomes. Your boat with the Delta Conic hull begins to really move once it gets on top of the water.
I'm also interested to know what the cost of your rebuild is going to be.
One other thing my builder is concerned about is water reversion if I go too radical with the cam because I do idle alot when trolling. Please let me know how things are progressing and what kind of performance your're looking to get. Any suggestions are welcome.
Good luck - keep me informed
I'm vey interested in what you're at doing because I'm looking to do the same thing on a 21000 lbs boat . First, do you have Crusader engines?
The reason being is You said that you have "2 454 MK IV,s one standard rotation one Reverse rotation "crank spins backwards" cam is standard direction reverse firing order "gear driven" -
Are you saying saying that your cam is a standard cam and not a reverse cam in the reverse engine? I was thinking I would have to get a special reverse grind cam on mine, but if it's standard cam that would be great.
I was hoping to use a mild cam that would utilize the added stroke to acheive about 400 to 420 hp and 500 lbs of torque in the crusing range. With our type of boats its all about torque, so any way I could acheive more of it that would be better. I also run 72c transmisions. As far as propping I deal with prop scan out of Chichago, they are excellant. With my boat I was hoping to get a couple more inches of pitch with the added torque and then cruise at a higher rpm. I use fuel flow meters and know that if I currently run at 3500 rpms I get better fuel ecoonomy than at 3200. I was hoping to run the rebuilt stroked engines at 3800 because despite the higher rpms the more the boat gets up out of the water the more efficient it becomes. Your boat with the Delta Conic hull begins to really move once it gets on top of the water.
I'm also interested to know what the cost of your rebuild is going to be.
One other thing my builder is concerned about is water reversion if I go too radical with the cam because I do idle alot when trolling. Please let me know how things are progressing and what kind of performance your're looking to get. Any suggestions are welcome.
Good luck - keep me informed
Not Standard Cams....Standard Rotation reverse firing order,Distr. gear is standard cut , Timing Gear is pressed on with a key way. my cam is at Cam motion being measured, Bob is having "6" sets of these made. for people like us. not cheep but Right.
Im not really worried about reversion because bob is working with the LSA so this should not be an issue.
Cost ???? well i build my own Engines... or i should say Assemble my own. but i will keep you all posted on cost as it all comes in.
01-10-2011, 08:10 PM
#23
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Fixx
Yes, Crusaders....
Not Standard Cams....Standard Rotation reverse firing order,Distr. gear is standard cut , Timing Gear is pressed on with a key way. my cam is at Cam motion being measured, Bob is having "6" sets of these made. for people like us. not cheep but Right.
Im not really worried about reversion because bob is working with the LSA so this should not be an issue.
Cost ???? well i build my own Engines... or i should say Assemble my own. but i will keep you all posted on cost as it all comes in.
Not Standard Cams....Standard Rotation reverse firing order,Distr. gear is standard cut , Timing Gear is pressed on with a key way. my cam is at Cam motion being measured, Bob is having "6" sets of these made. for people like us. not cheep but Right.
Im not really worried about reversion because bob is working with the LSA so this should not be an issue.
Cost ???? well i build my own Engines... or i should say Assemble my own. but i will keep you all posted on cost as it all comes in.
01-11-2011, 06:24 AM
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01-11-2011, 08:07 AM
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oil flow is the same, why the cam turns correct wat to drive the oil pump right, better off staying the the gear to gear set up..the new ones(which I have) run a chain and a reverse cut dist gears...ends up with all new issures there..long story...mine are crusaders with closed cooling as well...Rob
01-11-2011, 10:53 AM
#26
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So Bob is is cutting a couple of these cams? I may have to get back in touch with him about mine. I wish he could find some blank flat tappet billets. I have no reason to make the motor go roller and would like to upgrade the RR cam.
01-11-2011, 02:22 PM
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That's why these motors are built like they are. So everything works normal inside the motor except for the crank is going the other way.
So Bob is is cutting a couple of these cams? I may have to get back in touch with him about mine. I wish he could find some blank flat tappet billets. I have no reason to make the motor go roller and would like to upgrade the RR cam.
So Bob is is cutting a couple of these cams? I may have to get back in touch with him about mine. I wish he could find some blank flat tappet billets. I have no reason to make the motor go roller and would like to upgrade the RR cam.
as for the oilCooler i am trying to see what works well for everyone else. i figure the stock ones might not cool as well.
i will still keep eye on oil temps.
01-11-2011, 07:59 PM
#30
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A lot of cranks have little lines machined in at about a 45 degree angle where the rear seal contacts the crank to help push the oil back in the motor. On reverse rotation these lines slant opposite the standard rotation. On the reverse rotation motor you may want to have the lines polished out or they will help push oil past the seal. Look at your stock cranks closely and you will see what I mean.
