PDA

View Full Version : Engine rotation


DLewis
03-26-2008, 10:40 AM
I have a 95 Maristar with a 5.7 (275 hp) ~ I am in the process of upgrading the alternator, but need to know if this engine is a left or right hand rotation? Any ideas?

east tx skier
03-26-2008, 11:07 AM
The engine is left hand rotation.

DLewis
04-16-2008, 03:48 PM
I was told it was a right hand rotation (facing the front of the motor). So now I am a little confused. I am guessing the rotation is based on viewing the motor from the waterpump side, correct?

JLeuck64
04-16-2008, 03:54 PM
You are correct. Engine rotation is viewed from the front. Clockwise rotation is right and counter clockwise rotation is wrong (er, left).
J

KnoxX2
04-16-2008, 04:13 PM
WHAT Eastie was wrong!!!!!!!!!!!:eek: :eek3: :eek3:

M-Funf
04-16-2008, 04:16 PM
WHAT Eastie was wrong!!!!!!!!!!!:eek: :eek3: :eek3:

Naw. I believe that ETS is correct. Rotation is viewed from the back of the boat. So your boat is LHR.

Cheers!

wakeX2wake
04-16-2008, 04:44 PM
:confused: i'm confused :confused:

uawaterskier
04-16-2008, 04:55 PM
i thought it rotated up and down? LOL...nothing to add to the thread

east tx skier
04-16-2008, 05:17 PM
It is left hand rotation. This link (http://www.tmcowners.com/teamtalk/showpost.php?p=472266&postcount=2) should clear it up.

east tx skier
04-16-2008, 05:19 PM
The front and rear seems to be confusing. So let's do it this way. It's to port.

Sodar
04-16-2008, 05:24 PM
It is left hand rotation. This link (http://www.tmcowners.com/teamtalk/showpost.php?p=472266&postcount=2) should clear it up.

Ah! I understand now! :) So, what you are saying is that it is left hand rotation? :confused:

east tx skier
04-16-2008, 05:51 PM
Ah! I understand now! :) So, what you are saying is that it is left hand rotation? :confused:

That's right (left meaning to port). Even CCs (for many years now) with RH rotation props have left hand rotation engines.

MYMC
04-16-2008, 05:51 PM
All Chevrolets rotate clockwise when viewed from the front (i.e. facing the crank balancer/dampner).

Unless of course Smokey Yunick built it: "Between 1958 and 1973, Yunick also participated in Indianapolis 500 racing, his car winning the 1960 race. His innovations here included the "Reverse Torque Special" of 1959, with the engine running in opposite rotation than normal"

MYMC
04-16-2008, 05:54 PM
That's right. Even CCs (for many years now) with RH rotation props have left hand rotation engines.
It is WAAY cheaper to build transmissions to reverse the prop than to try and build a reverse rotation engine...gasoline versions of this have been gone for many, many years.

jimmer2880
04-16-2008, 07:03 PM
Just be sure you are putting a marine alternator back on the boat. There is a difference. You wouldn't want to go boom.

east tx skier
04-16-2008, 07:31 PM
It is WAAY cheaper to build transmissions to reverse the prop than to try and build a reverse rotation engine...gasoline versions of this have been gone for many, many years.

Maybe TRBenj has the answer, but I think it was early 80s when they were doing that.

TMCNo1
04-16-2008, 07:39 PM
And the whole time, I thought my engine and boat rotated around the crankshaft, shaft and prop RH, what do I know, right?

TRBenj
04-17-2008, 09:00 AM
Maybe TRBenj has the answer, but I think it was early 80s when they were doing that.
Just about every CC prior to '89 had a reverse rotation (RH) engine. They continued to use them in 1:1 boats through at least '94 so they could swing a RH prop. The 1.23 (introduced in '89) reverses the direction of rotation, so a LH motor can turn a RH prop.

MYMC, thats not a true statment. The Chevies that CC used prior to '89 were reverse rotation engines too. They were primarily 454's and 350's in later years, though they used 305's, 307's and 327's as well, dating back to the early 60's. Reverse rotation engines are/were pretty common in twin engine inboards too- they'd install one engine of each rotation so the props spin opposite and the torque cancels out.

MYMC
04-17-2008, 10:25 AM
Just about every CC prior to '89 had a reverse rotation (RH) engine. They continued to use them in 1:1 boats through at least '94 so they could swing a RH prop. The 1.23 (introduced in '89) reverses the direction of rotation, so a LH motor can turn a RH prop.

MYMC, thats not a true statment. The Chevies that CC used prior to '89 were reverse rotation engines too. They were primarily 454's and 350's in later years, though they used 305's, 307's and 327's as well, dating back to the early 60's. Reverse rotation engines are/were pretty common in twin engine inboards too- they'd install one engine of each rotation so the props spin opposite and the torque cancels out.
I stand corrected but please allow me to clarify...all Chevrolet's rotate clockwise from Chevrolet in the last 20 years...percentage wise no spark ignition marine engine supplier is a "builder" anymore. It is FAR cheaper to modify the transmission to reverse prop rotation than to build reverse rotation engines. As a matter of point in 2003 when MC tried reverse rotation in the V-drives we corrected it by simply moving the cables so that reverse was forward and forward was reverse.

I am/was aware of the CC boats and twin engine big boats; however, my answer was germane to the question and was too broad for the overall topic...my mistake.

MMCCAR12
04-17-2008, 11:13 AM
I have no comment but my head is now spinning right and left!!!

Sodar
04-17-2008, 11:29 AM
Do the new 280/X-80 and CSX 265 have counter rotating props? If so, did they just reverse the tranny on one side??

6ballsisall
04-17-2008, 11:34 AM
^^^^^^^^Ha! The moderator said Tranny.

MYMC
04-17-2008, 12:03 PM
Do the new 280/X-80 and CSX 265 have counter rotating props? If so, did they just reverse the tranny on one side??
Yes, and yes.

MMCCAR12
04-17-2008, 12:05 PM
He lives in
Seal Beach not Lauguna Beach.

FrankSchwab
04-17-2008, 02:55 PM
MYMC -
I don't know who provides them or which boats use them, but:
SkiDim (http://skidim.com/products.asp?dept=1013) sells both LH and RH 5.7L engines.

KHall
04-17-2008, 03:03 PM
The Hurth tranmissions can handle full power in both directions.

MYMC
04-17-2008, 03:14 PM
MYMC -
I don't know who provides them or which boats use them, but:
SkiDim (http://skidim.com/products.asp?dept=1013) sells both LH and RH 5.7L engines.
All the right hand engines they sell are converted by PCM (using a standard rotation 5.7 Vortec) or are rebuilds.

trickskier
04-17-2008, 03:40 PM
Do the new 280/X-80 and CSX 265 have counter rotating props? If so, did they just reverse the tranny on one side??
And what is the circumference of the Moon??? :rolleyes:

Sodar
04-17-2008, 03:55 PM
And what is the circumference of the Moon??? :rolleyes:

6,790 miles

trickskier
04-17-2008, 04:01 PM
6,790 miles
Thanks, I knew you would know.................8p

TMCNo1
04-17-2008, 04:06 PM
And what is the circumference of the Moon??? :rolleyes:

Did the lunar lander have a transmission and did it have ATF or 50 wt oil in it?:confused:

454Prostar190
04-18-2008, 01:41 PM
^^^^^^^^Ha! The moderator said Tranny.

We have lots of "Tranny's" here. Down by Polk and Hyde:rolleyes: