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Discussion Starter #1
Been working on Tcat 1998, Originally
was first one Ive ever taken all apart. I also decided to just take engine completely apart after all the water pump horror stories. I wondered if the Ports from Factory are the same on all the 1000 cylinders? Thanx
 

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Not sure about that. But... are you going to drill holes in the bottom of the cylinders to lube the shaft bearings?
Has anyone tried this? Personally I've never heard if this but I'm not certain. I would be a little leary unless I knew if it worked
 

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No supercession, same cylinders used from 1998 through 2002.

Major differences in 1999- on was the timing mapped into the CDI’s. Also the full exhaust sustem (98 was 3 into 3 exiting as 3 individual ports at cans bottom), 1999-on was 3 into 3, exiting as one large dump port at cans bottom)

Roundslides (1998) produce pure raw HP numbers versus flatracks. Flatracks do offer better low and mid range throttle response.
 

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Has anyone tried this? Personally I've never heard if this but I'm not certain. I would be a little leary unless I knew if it worked
Yes, did it on my '01 when I had it apart. Auggie recommended it to me. Looking at it when apart, it made complete sense.
 

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Has anyone tried this? Personally I've never heard if this but I'm not certain. I would be a little leary unless I knew if it worked

I have done it on several engines. Yes, once the mod is done and taken apart there is oil in the balance shaft area so bearing life will be extended for sure. I chamfer the crank bearing too to avoid blocking the flow. This would be the outer hole the pen is NOT pointing to in the link. Be sure to tape off everything so debris doesn't get into the bearings. Be sure to chamfer the correct spot on the bearing and not 180* off. lol. Can be done easily. Thanks Auggie for putting me on to this mod.!!



Thundercat Engine Rubuild and Bearings
 

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Not sure about that. But... are you going to drill holes in the bottom of the cylinders to lube the shaft bearings?
I'm lost? TallCool1 asked about drilling holes in the bottom of the cylinders and all I'm seeing is crank and crank case mods. What am I missing?
 

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Not sure about that. But... are you going to drill holes in the bottom of the cylinders to lube the shaft bearings?

All ports will be the same on all 1000 cylinders to answer the question.


Instead of saying drill the bottom of cylinders, Jim meant to say drill holes in the crank case. Can't lube balance shaft bearings from the cylinders. lol. :smile
 

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Okay thanks lol! That makes more sense, I wasn't sure if the cylinder skirts were shrouding the balance shaft bearings or what:)
 

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Discussion Starter #10
Thanx!

For all the Replies. I guess every ones drilling holes in they're cases now? I just wondered about the 1998 Tcat 1000 cylinders ,I was before thinking perhaps the cylinder porting was a little better than the Factory Work. Guess its all in the exhaust and cdi that makes the 1998 the stock fastest. It cant be a LOT faster than other years ? Thats stock for stock? I wanted to own one that was bone stock but..looks like that wont be happening. Modified ones are much more Fun to ride. Thanx
 

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For all the Replies. I guess every ones drilling holes in they're cases now? I just wondered about the 1998 Tcat 1000 cylinders ,I was before thinking perhaps the cylinder porting was a little better than the Factory Work. Guess its all in the exhaust and cdi that makes the 1998 the stock fastest. It cant be a LOT faster than other years ? Thats stock for stock? I wanted to own one that was bone stock but..looks like that wont be happening. Modified ones are much more Fun to ride. Thanx
Put 2 equally prepped side by side (1) 1998, and (1) other MY...

Equal traction, clutched to proper rpms/proper jetting/blah-blah-blah, etc, etc, etc, etc... the 1998 will crush the later models. It was a beast.

Same for first year ZRT600’s and 800’s versus following MY’s. When Cat released them, they’d done their homework. It was following those initial releases (when fine tuning ended up costing them a few more $$ than they really liked), and customers were drooling to buy following MY’s models, they “softened” things up just a touch, often to the disappointment of buyers who were expecting same perf as first year releases.

I’ve noted this in a lot of their performance models over the years (short of the 440/580/700 ZR1 chassis’d Sleds during their time)
 

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Discussion Starter #14
Thankyou for the Update. I imagine the 1998 cdi would be also highly sought after and much coveted ha ha ha . Or would a 1993 cdi make a later 1998 come alive even more so.??
 

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93 and 98 CDI’s don’t interchange.

To equate a 1998, you’ll need CDI, carbs/airbox, ex’s system from expansion chambers outwards. And obviously, the matching clutching.

1998-on went with oil being injected into the fuel pump (not into intakes), and that has always raised some controversy as to how that can (and sometimes does) affect jetting (and lubing under certain running conditions) versus full time into the intakes.

Just sayin’, they changed several items from 1998 to 1999
 

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One thing to add here is that the 98 stock pipes are very hard to beat in HP. They are claimed to be the best for a 1000. The gain is very marginal with aftermarket pipes. Only thing you will gain with them over stock is the loss of weight on the front end of the sled.
Between the ignition and pipes they ran very good. The 93 had the better timing though. If you put the 93 on any sled no matter how you do it with different parts it will run stronger. The gains are small, and that's why some just go with an offset key in the flywheel.
 

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93 and 98 CDI’s don’t interchange.

To equate a 1998, you’ll need CDI, carbs/airbox, ex’s system from expansion chambers outwards. And obviously, the matching clutching.

1998-on went with oil being injected into the fuel pump (not into intakes), and that has always raised some controversy as to how that can (and sometimes does) affect jetting (and lubing under certain running conditions) versus full time into the intakes.

Just sayin’, they changed several items from 1998 to 1999
My 98 T-cat has the oil pump feeding the fuel pump. I noticed that right away and thought it was a pretty cool way to mix in the oil and pre-mix absolutely affects the jetting by physics, for every molecule of space the oil takes up passing through the jet is one less molecule for the fuel.
 

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My 98 T-cat has the oil pump feeding the fuel pump. I noticed that right away and thought it was a pretty cool way to mix in the oil and pre-mix absolutely affects the jetting by physics, for every molecule of space the oil takes up passing through the jet is one less molecule for the fuel.
I’ve seen a couple vintage 98’s that had individual injection to each intake flange. I’m thinking they were early production maybe?
 

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Discussion Starter #19
I would think a separate Oil Line to each Cylinder would be the way to go or perhaps Premix but..Trail Riding makes Oil Injection Nice. Hey thanx to all for the replies.
 
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