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Old 06-05-2005, 09:36 AM   #316
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Anyone who is interested can send a "NEW" OS12TZ engine to EB MODS and he will mod it identical to the way he did mine for the Texas Biggie. This thing was just flat out amazing , we are talking 1/8 scale speeds. Insteed of the normal $120.00 he will do it for $80.00 , this includes the shipping back to you . The engine must be an OS12TZ and you mst mention my name . (Ron Atomic) His web site is www.ebmods.com
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Old 06-05-2005, 04:46 PM   #317
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I just want to know if i can use novarossi plugs, i think i will have a problem getting OS turbo plugs as my 2 lhs dont have them.
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Old 06-05-2005, 07:37 PM   #318
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Quote:
Originally Posted by Darth Vader
OK, here's my initial impression of the TZ.
I got the 5-port model with slide carb. Fitted on my S710.
Commenced run in yesterday.

Before I installed it, I took it apart to check the internals for any dirt, debris, etc. Looks good. Now I regret not taking pics.

Run in,
1st tank, ran really rich at WOT to flush out whatever foreign items left in the engine. Temp at around 70+C.

2nd tank, leaned a bit and ran around the track straight at mostly WOT. Temp in the 80+C range. Stopped after 1/2 tank let engine cool and commenced running.

Same for the 3rd tank. Leaned slightly, about 15~20degrees HSN.

4th tank, ran full tank around the track, like normal driving, leaned enough for 2nd speed to kick in but still very rich. At this point, HSN is about 1 1/2 to 1 3/4 turns out from fully closed. Didn't touch the other 2 needles so far.

5th tank, leaned to 1 1/2 turns out. Running very rich but able to kick in 2nd speed without problem. Down the straight, , already as fast as my 12 TR. Infield still sluggish because still very rich.
Engine temp, still around 90C... Exhaust manifold temp at 120C range.

FYI, I ran it at night. Ambient temp around 25degrees.

P/S still very tight. Sometimes, still jammed at TDC when I try to start from cold.

Will continue run in this weekend.

Gonna bring engine temp to around 100+C from 6th tank onwards to get proper heat cycling.

I welcome any comments, tips ,etc...

Cheers...
Completed my run in last weekend. Finally...

From the 7th~8th tank onward, it became difficult to run with very rich settings. So, had to lean the bugger. At around the 10th tank, the temp was at around 120C and that was in the middle of a hot Malaysian day. With the same setting, it dropped to around 105C in the evening, when it's cooler.

Didn't have the time to sort out my gearing and 2-speed yet. I think the 2 speed is opening too early. It was set for my previous engine, the TR.

The engine is fast. At least on par with the Novas.
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Old 06-05-2005, 09:06 PM   #319
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Quote:
Originally Posted by caggers
Can i use any other brand turbo plug on the TZ or does it only take OS ones?
I use the Novarossi C6TGF plugs without any problems over here in the west. The original plug that came with the motor died pretty quickly but you would expect that during break in.

The Novarossi plugs last really well in this engine.

Cheers,

Mike.
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Old 06-05-2005, 09:34 PM   #320
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are you guys running the 3-port or 5-port TZ?
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Old 06-06-2005, 12:22 AM   #321
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Quote:
Originally Posted by Z00M
I use the Novarossi C6TGF plugs without any problems over here in the west. The original plug that came with the motor died pretty quickly but you would expect that during break in.

The Novarossi plugs last really well in this engine.

Cheers,

Mike.
My engine actually came with a faulty plug.
I used an old plug for running in and then changed to the one thact came with the engine. Keeps stalling when I remove the glow igniter. Changed to another plug and was OK.
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Old 06-06-2005, 12:23 AM   #322
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Quote:
Originally Posted by wyl03
are you guys running the 3-port or 5-port TZ?
5-port...
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Old 06-06-2005, 01:46 AM   #323
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Witnessed first hand this little beast at a club meet at the next worlds track yesterday. The motor had good power right around the course. Just have to see the durability side of things now. But it's pretty impressive motor good job OS. :
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Old 06-06-2005, 10:13 AM   #324
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Which engine do guys recommend for offroad racing the 3 or 5 port?
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Old 06-06-2005, 10:29 AM   #325
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Quote:
Originally Posted by yodace
Which engine do guys recommend for offroad racing the 3 or 5 port?
Probably the 3-port for short tracks and the 5-port for the larger tracks where you may need the power if there is a long straightaway and long jumps. Just my opinion.
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Old 06-06-2005, 12:57 PM   #326
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Quote:
Originally Posted by yodace
Which engine do guys recommend for offroad racing the 3 or 5 port?
3 port would be easier to drive and better low end, if power is what you want then it would be 5 port.
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Old 06-06-2005, 05:27 PM   #327
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Quote:
Originally Posted by finchy
Witnessed first hand this little beast at a club meet at the next worlds track yesterday. The motor had good power right around the course. Just have to see the durability side of things now. But it's pretty impressive motor good job OS. :
I think you'll find a few people will start bolting in these new TZ's. I have run mine now for the equivalent of 7 race meetings so far and it doesn't even look like slowing yet. Very minimal wear on the rod, maybe the bearings could use replacing shortly, but apart from that I have no issues at all. Still has very good compression, even when hot.

The only hint or tip I can suggest is that the carb retaining bolt should be tightened as per the direction in the manual, otherwise the clear spacer around the base of the carb does crack. I know, I didn't read the book
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Old 06-06-2005, 05:27 PM   #328
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how about mileage?
would there be significant differences in fuel consumption between a 3 vs 5-port?

ZOOM - are u running the 3 port in WA?

Last edited by wyl03; 06-07-2005 at 05:45 PM.
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Old 06-07-2005, 01:34 AM   #329
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Zoom your quite right, for the money you can't go passed these engines. I run the VZR ver II in my MRX3 and will it's not quite the missle the Nova based engines are the power band seems to be more linear. This something I really notice with the 12TZ on the weekend and how cool they run.
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Old 06-08-2005, 06:46 PM   #330
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I just got my V1RRR WCE put together. Now, the next task for me is to break in the engine. I have a TZ 5 ports. what would be a good break-in process? Would it be worthwhile to buy a break-in stand? What I have in mind is a cheap one(still expensive), like Nanda engine break in stand. Any suggestions? thx.
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