1985 Supra Comp - Technical Info

[Supra_Comp]

Hi all!

I was just curious to find out what the weight of my 1985 Comp TS6M would be?

I have been having some issues with the boat being "sluggish" out of the hole shot, and I know the motor does run well with all the new parts I threw at it.

My thinking is that I had an issue where the rivets holding the deck and hull let go on the starboard rear side of the boat. For a while we did not know about this and would have to bilge out the boat frequently (alot). When making corners the deck/hull would open up a gap and water would come through there. Do you think the foam in the rear section of the boat has become water logged and is adding additional weight??

Also, for engine timing, is anyone running advanced timing (from the stock 10 degrees)? Did you notice and response differences?

Any information is appreciated!! Photos will give you an idea of how it sits in the water.

http://a4.sphotos.ak.fbcdn.net/photos-ak-snc1/v262/58/121/502071902/n502071902_800875_4022.jpg
http://a1.sphotos.ak.fbcdn.net/photos-ak-snc1/v315/135/75/500898520/n500898520_819046_4749.jpg

[Jetlink]

Sharp looking boat there. My comp had issues when I first got it with getting out of it's own way sometimes. I also had the constant bilging issue that you described. What I did about the rub rail issue was to apply silicone along the bottom of the rubrail to seal it to the hull where water was entering. That is where I would start with on that issue. I have noticed though that my boat always seems to be heavier on the starboard side and I attribute this to water getting into the hull and due to the stringer design has saturated the foam. A deck off restoration is in my near future I bet.

As for the timing issue, mine was initially retarded from TDC when I got it and the plugs were not gapped properly. After gapping them accordingly and adjusting the timing, my boat runs like a top and has no issues getting out of the water, even had enough power to get 5 adults out of the water on skis in about 8 seconds.

[Supra_Comp]

Thanks Jet!

I definitely cannot pull 5 adults out of the water on skis! My boat is really bogged down for some reason. I am almost wondering if it has something to do with the weight, as well as the carb. It has a vacuum seconday 4 bbl Holley, and I have had the engine cover off and noticed that the secondaries didn't open up under load.

[Jetlink]

Yeah, I ended up scrapping my Holley this past season. The secondaries failed open on me while out on the river and flooded the engine. I switched to Edlebrock and have been happy so far. Carb choice is like an opinion though, what is right for me, others might not agree on. Also, has the ignition been upgraded?

[crystal waters]

the original 85 comp was 2185 lbs dry. Add to that any extras such as your tower etc.

[Supra_Comp]

Has anyone had any experience with OJ props? Specifically the 3 blade 13x11.5 (0.90 cup)? I have heard and seen nothing but positives about this prop, especially for boats with sluggish hole shots.

Im also beginning to think (discussions with other guys) that the prop on my boat may not be stock and was just thrown on to make the sale. This boat was riddled with automotive parts that I replaced, and when the trans was rebuilt and pulled from the motor, the motor basically sprung/twisted to the right from a huge misalignment...thinking it was possibly a rock hit! but who knows...

Havent checked the markigns on the prop yet to see whats on it.

[Hagman]

A 1986 comps dry weight is 2200 lbs.

[Supra_Comp]

Here are the photos of the prop on the boat as it sits now. Is this an original? Looks like 13x12.

http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00066-20120120-1124.jpg
http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00065-20120120-1124.jpg
http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00064-20120120-1124.jpg

[Jetlink]

Without having my boat in front of me to check numbers, I want to say that looks like the exact same prop that I am running on my boat right now though I do plan on getting a new one in the future and keeping the one on there as a spare.

[Supra_Comp]

Ok good to know Jet! At least I can knock that one off the list, its a pricey one to replace!

One of the biggest issues I have that goes along wit hthe sluggish starts is vapour lock on warm days. Anyone else have that issue?

[Jetlink]

What you are talking about might be caused by the amount of heat build up that the engine experiences after running under load and then being shut off for any period of time. The temp will increase due to the lack of cool water circulating. Next time you are out on the water and shut down after running for a bit, crack open or fully open the dog house and see if that helps the situation.

[Hagman]

My 86 comp was set up for sea level & came OME with a 13x13. It ran out at about 43mph @ 4300rpm. A couple years ago I changed to a 4 blade 13 X 12.5 it runs out the same but a bit smoothers. I’ve attached some pictures of the Supra brochure that came with the boat that has all of the specifications86358636

[jet]

Hey wait a min. He's Jet#2. lol I would start with 2-things real quick. Rebuild the carb ($50-$90) and new gas filters everywhere. i added one before the fuel pump (glass) and one after the fuel pump that way I can see whats coming out of the tank and how clean it is going into the carb. These are cheap fixes but are a must!! To have a plat-form or good idle to work with. 3rd!! GET THE PRESTOLITE POINTLESS IGNITION $145?? Its the 2nd BEST uprgrade I ever did and I havnt had ONE starting issue in 4-5 yrs now since making the switch. 4th let me just say 4-BLADE!!!!!!!!!!!!!! My boat jumps out of the water now even with 1700-1800lbs in it. DO IT!! DO IT!!

[Jetlink]

4th let me just say 4-BLADE!!!!!!!!!!!!!! My boat jumps out of the water now even with 1700-1800lbs in it. DO IT!! DO IT!!When you getting that five blade prop made up?:lol:

[drize]

You may also wish to check the timing as well. I had a similar sluggish problem with my '89 comp and a slight rotation of the distributor cap fixed it. Best to use a timing light and the specs from the manufacturer but I did mine by trial and error. Good Luck

[Danthejeep]

Here are the photos of the prop on the boat as it sits now. Is this an original? Looks like 13x12.

http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00066-20120120-1124.jpg
http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00065-20120120-1124.jpg
http://i678.photobucket.com/albums/vv142/GT40_Sally/IMG00064-20120120-1124.jpg
I have a1988 supra comp,I'm running the same prop as you. It works great. When I bought my boat it had no power, bad, old fuel. I filled with new gas and it slowly came back to life. I had her on the river softly after and she kept falling on her face, the screen to my carb was plugged and I kept sucking my four barrel bowels dry. I repaired that and changed all the gas line, it was almost completely swelled shut from age. I checked my compression and I'm tuning about 135 psi per cylinder which I thought was kind of low. Whith that low of compression I decided to bump my timing up to about 15 btdc and run premium fuel. With my set up I can pull me my two brothers and my dad up at one time. That's about 750 pounds of guy behind the boat and 400 more in the boat. I have also upgraded my points to electronic ignition, by pertronix. Super easy upgrade, much better starting and idling. Stronger hotter spark = more power

[jet]

Keep it going man, just come up with a plane to change everything because you will anyway. lol.

[Hagman]

I could scan the Brochure and email it to you like a picture will that work for Ya.


89308931

[lbagby]

the '86 comp weight spec'd out at 2,200 lbs.

'86 comp original owner

[Supra_Comp]

Bringing this back from the dead!

So I had the boat out over the long weekend and had made some changes but it is still the same and I have now narrowed the problem area. I had adjusted the timing up to 10 degrees as it was only at about 5, and am getting about 30 at total timing.thought it would make a difference but it didn't!

I did the paper clip test on the secondaries and after multiple full throttle runs I noticed they did not budge. So, what could I be looking at? I am going to do a compression test and check vacuum at idle to make sure the motor is still healthy, but after that, should I be looking at carb gaskets to ensure no vacuum leaks? Because of the secondaries not opening it also causes the motor to work harder to pull p skiers and after a few runs it begins to bog down hard due to heat and then will just shut off and won't start until she is cooled down (I assume vapor locked some sort).

Any thoughts opinions on where to go from here?

[Cassiedee]

I have a 1988 Comp and just put an OJ 13x11.5 on it last week. Runs great-42mph on the top end. I have always had Mastercraft's in the past, I have noticed with this boat it does seem a little sluggish.

[Supra_Comp]

Well, you can put this thread to rest. The issue of my lack of power and bogging has been found and not resolved....

I need a new motor/rebuild. Compression on the motor was way low. #8 was at 105 psi and everything else ranged from 110-118 psi and according to the specs a strong healthy motor should be at 150 psi and not ranging more than 5% per cylinder.

:x SOB!

Are there any good engine builders in the Southern Ontario region? (Canada).

[mickeycoke]

Looking for users manual and / or wiring diagram for 1985 comp ts6m comp. Any help would be much appreciated.


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[crystal waters]

Looking for users manual and / or wiring diagram for 1985 comp ts6m comp. Any help would be much appreciated.


Sent from my iPhone using Tapatalk

Have photos of 89 conbrio
Same as comp
Pm me your email and I will fwd to you

[suprasaltareaud]

Im pretty sure 105 in one cylinder and 110-118 in the rest is not an insane difference. That wouldn't be causing it to bog down and stop surely? It is low but are u sure that's what the problem is? If it runs ok for a bit then dies doesn't that suggests something else.

[MarbleFalls]

Compression is not your issue. Keep searching my friend.

[MarbleFalls]

Have photos of 89 conbrio
Same as comp
Pm me your email and I will fwd to you

If the wiring diagram is the same as an '85 Supra Comp I sure could use one as well. [email protected] Thanks!!