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View Full Version : what engine do I have?


Boogieman
01-03-2008, 02:40 PM
ok . . since I probably need a new one . . I would like to know the exact type of my engine . . .

Indmar 350 MFI ??? (says the swiss-pollution-sticker on the valve cover)

http://img296.imageshack.us/img296/4808/wpp1bu1.jpg

the boat is a '97 ProStar 205 and the engine normaly has a kind of futuristic looking cover over the air filter . ..

anybody can tell from the picture?? or can you tell me where to look for the exact type? .. any numbers somewhere on the block? . . either I'm blind .. or there aren't any

JohnnyB
01-03-2008, 02:52 PM
Would probably be easier with the valve covers, exhaust risers and air filter/housing in place....

Boogieman
01-03-2008, 02:58 PM
I know . . but I don't have a picture like that at hand right now .. .

learjet2230
01-03-2008, 03:11 PM
Looks like and Indmar of the Chevy variety. It has the Indmar thermostat housing. Also the distributor is at the rear, Fords are in the front. As far as cubic inches, if I were to take a gamble I'd say 350. Not super familiar with all the engine varieties, my guess is a Chevy 350 TBI.

6ballsisall
01-03-2008, 03:12 PM
I am about 85% certain that is the 275hp motor.

Boogieman
01-03-2008, 03:15 PM
hmmm . . just found a picture of a engine like mine . .

http://img165.imageshack.us/img165/7489/picture5mc7.png

I think it was the base model in '97 . . . somewhere around 275hp . . and it's for sure a indmar 350

east tx skier
01-03-2008, 03:25 PM
I am about 85% certain that is the 275hp motor.


You're right, it's the throttle body injected 350. I think the only other alternative in 97 was the LT-1. I don't see anything else listed in the manual.

Boogieman
01-03-2008, 03:27 PM
hmm . . ok . . is this information enough to order a "new" (or good used) crate engine? . . .

east tx skier
01-03-2008, 03:40 PM
hmm . . ok . . is this information enough to order a "new" (or good used) crate engine? . . .

Go to www.mastercraft.com and click the knowledge center link. Download the 1996 owner's manual. It lists the specs for the 350 TBI engine (same as in your 97).

Ric
01-03-2008, 04:30 PM
yep looks like a 350 chivvy TBI. why do you need a new motor? do we want to know the story?

wgwollet
01-03-2008, 04:42 PM
Wow, what made the engine no good? That thing school last for over 2000 hours mine did........:cool:

BrianM
01-03-2008, 05:05 PM
I second, third or fourth it. That is absolutely positively a 5.7L Chevy TBI 275hp. Looks just like the one in my '97

JohnnyB
01-03-2008, 09:00 PM
If you wanted to be absolutely sure, you could call a dealer. If you gave them the HID#, they can probably tell you what engine is in it.

JimN
01-03-2008, 09:13 PM
Boogieman- if you look on your oil pan, the white sticker has an IC97xxxx number on it. That's the motor serial number. Yes, you have a GM 5.7L and if the spark plugs are MR43LTS, it's the Vortec motor. If you want the most info for that specific motor, call MC or Indmar and give them the motor serial number. They can tell you as much as anyone.

Next time, instead of using that petcock on the side of the motor with the knock sensor, just remove the sensor for draining. Petcocks are really good for making someone think it's draining well, when it's not. removing the knock sensor will cause the water to gush out and carry debris, sand and silt with it. If there's one on the other side, get rid of it and use a brass NPT threaded plug.

east tx skier
01-03-2008, 10:28 PM
Hey, Jim, were they putting Vortec motors in MCs in 97? The shroud definitely looks like the MX vortec TBI, but I didn't think those were in the picture until 1998

BrianM
01-03-2008, 10:31 PM
No Vortec heads in '97 model year boats at least not with the TBI motor..

JimN
01-03-2008, 11:31 PM
Might have been a few early ones in '97 but I did say that if the plugs were MR43LTS... just as an FYI. In a case like this, I would definitely recommend using the sticker to get the motor's serial number, which is clearly visible in the photo, to call for info.

I thought I may have worked on some Vortec TBI in '97 but they may have been '98 models.

east tx skier
01-04-2008, 12:06 AM
Either way, if he's replacing it, go with the vortec.

climbinggod
01-04-2008, 02:05 AM
Is it only EFI engines that have knock sensors?? What is it a what does it do??

coz
01-04-2008, 08:16 AM
hmmm . . just found a picture of a engine like mine . .

http://img165.imageshack.us/img165/7489/picture5mc7.png

I think it was the base model in '97 . . . somewhere around 275hp . . and it's for sure a indmar 350

I have a 98 PS 205 and that engine looks exactly like mine, 5.7 Vortec 300-HP (actually 298) and EFI.

http://farm3.static.flickr.com/2164/2093611722_deb1a704a2.jpg
http://www.tmcowners.com/photopost/data/500/53.jpg

BrianM
01-04-2008, 10:21 AM
I have a 98 PS 205 and that engine looks exactly like mine, 5.7 Vortec 300-HP (actually 298) and EFI.

http://farm3.static.flickr.com/2164/2093611722_deb1a704a2.jpg
http://www.tmcowners.com/photopost/data/500/53.jpg
'97s look exactly the same except for no Vortec sticker on the cowl and no Vortec heads.

JimN
01-04-2008, 10:41 AM
climbinggod- if you look at the first photo, there's a brass fitting with a petcock and a larger part that has a blue wire connected, at a right angle to the petcock. That's the knock sensor and yes, only injected motors with an ECM have one. When the motor experiences detonation from excessive timing advance, carbon deposits, low octane/high compression with hot and dry air (among other reasons), the ECM will pull the timing advance back in 5 degree increments until the knock is gone it it reaches base timing.

rkmason
01-04-2008, 10:59 AM
Is it only EFI engines that have knock sensors?? What is it a what does it do??

The knock sensor is used to keep the engine from detonating (knocking) for any reason by signaling the EFI ignition system to retard ignition timing. It is a piezoelectric microphone that is sensitive to the engine block vibration frequencies that occur when the engine is beginning to detonate (which happens long before you can hear the knock yourself). You need to have a computer controlled ignition system to be able to use the knock sensor signal. Modern OEM EFI systems handle fueling and ignition so they can utilize a knock sensor, but there is no reason you could not use a knock sensor on a carbureted engine if you had a computer-controlled ignition system that can accept a knock sensor input.

east tx skier
01-04-2008, 11:24 AM
I have a 98 PS 205 and that engine looks exactly like mine, 5.7 Vortec 300-HP (actually 298) and EFI.


I thought it was 308 hp in the vortec TBI in 98.

coz
01-04-2008, 12:07 PM
I thought it was 308 hp in the vortec TBI in 98.

My 1998 owners manual says MC Vortec MX Plus Marine Electronic Fuel Injection: 350 C.I.D.(5.7 Litres)-298 Horsepower :D
The Corvette LT-1 for that year is 328 HP

east tx skier
01-04-2008, 01:25 PM
My 1998 owners manual says MC Vortec MX Plus Marine Electronic Fuel Injection: 350 C.I.D.(5.7 Litres)-298 Horsepower :D
The Corvette LT-1 for that year is 328 HP

Well how 'bout that. It does indeed say that. Of course, it's not the first time that the owner's manual has conflicted with the WSM specs.

Also, the anniversary boats had LT1s with 340 hp (different cam).

east tx skier
01-05-2008, 12:20 AM
Also, from the 1998 Brochure

hester
05-15-2008, 08:12 AM
Trying to confirm engine type in my new-to-me 1999 Prostar 205. I've crawled all over and cannot find the official plate/stamp etc. All I can find is the marking on the block that says GM5.7L. Also found the trans plate and it is a HFW 450 D A 1.00 B 1.03.

If I'm not mistaken it is the LTR 330hp but would someone confirm this for me. I don't have an exact picture but the engine matches this picture perfectly without the Duvall plate.

Iíve also tried to do the HIN lookup in the FAQ section but everything matches except for the motor and boat type. Mine are D for Engine and T for boat type.

Thanks in advance for your help.

JimN
05-15-2008, 08:44 AM
You do have the LTR. You can also contact MC and tell them the hull ID number.

Jim@BAWS
05-15-2008, 08:44 AM
Hester,

Looks like you got yourself a real nice boat.

Your motor is a 330 HP LTR motor

Jim@BAWS




Trying to confirm engine type in my new-to-me 1999 Prostar 205. I've crawled all over and cannot find the official plate/stamp etc. All I can find is the marking on the block that says GM5.7L. Also found the trans plate and it is a HFW 450 D A 1.00 B 1.03.

If I'm not mistaken it is the LTR 330hp but would someone confirm this for me. I don't have an exact picture but the engine matches this picture perfectly without the Duvall plate.

Iíve also tried to do the HIN lookup in the FAQ section but everything matches except for the motor and boat type. Mine are D for Engine and T for boat type.

Thanks in advance for your help.

gigem75
05-15-2008, 01:03 PM
if I might ask, why would you "probably" need a new one?

hester
05-15-2008, 01:23 PM
if I might ask, why would you "probably" need a new one?

I think you might be a bit confused. I brought this thread back from the dead so that the information would be together for future searches. When I was researching my motor I found this old thread and it was not useful. Hopefully with my issue attached it will be for someone else.