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Old 07-07-2009, 06:22 AM   #151
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Questions??

Quote:
Originally Posted by Nitro-Racer* View Post
first of all the tuned version of an engine:
  • all parts are checked so there is the best fit between the parts(piston cylinder). they are choosen by hand
  • also when it says tuned it means that the crankshaft has been worked, and is now lighter since it is worked some metal is gone... and also the crankshaft "hole" is widened i think and there is also a better fuel flow since it is polished.
so in the end the tuned version is always better(meaning faster) than the "stock" version, but cant say that the stock version is not fast, its Very fast also.

NiTrO BoOsTeR to answer your question, i always have the same problem what i do is check the underside of my head, because there are marks left from the button head. i think it doesnt really matter which site the button head is...
hope this helps
I note on the Nova site that the 3SCT is still in production. The crank in the 3SCT is the same dia as the 353-09 (11.9mm). My question is, is the 3SCT a comparable engine to the 353-09 or is the 353-09 a significantly better engine and one that should be bought instead of the 3SCT (tuned version).
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Old 07-07-2009, 06:55 AM   #152
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hmm here i can not answer you fully but just help you decide. the sct is an engine that has low to mid power while the 353 has mid to top power. i think it all depends on the driver, track and driving style. the 353 09 and 3sct tuned logicaly should be equal but they are not because one is different from the other. its up to you to decide if you want more top end or more bottom end depending on the...bla bla bla
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Old 07-07-2009, 07:56 AM   #153
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I have both of the engines and the difference is exactly as you stated. The 353 '09 is more of a top end engine better suited for larger tracks like 301 in Maryland where you need the legs for that straight, the 3SCT tuned is better suited for smaller tracks where the low end power it produces can be benenficial.
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Old 07-08-2009, 07:16 AM   #154
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You should also know that with 2630 pipe and 5fin manifolt, SCT has enough topspeed for large tracks as Bumod, but with that combination, making 5 minutes is very hard duty.
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Old 07-11-2009, 12:29 AM   #155
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Originally Posted by jt415gz View Post
Hey Jason...no air filter I'll try that...how is R.A.M.S these days?
What happened to the MRX4X?
Are you running the Evolva M3 nowadays?
I just built my M3 a few weeks ago...and it is very similar to my old Mugen...just picked up a Flash .21, gonna break that in this weekend (hopefully)
Hope to get back to R.A.M.S. again soon (too much work here in S.F.)

Take it easy~
Hope to see you out there soon. I was running my flash last race and it looks to be a very nice motor
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Old 07-11-2009, 02:17 AM   #156
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I have seen several Flash engines broken with the same error, all had scratches and a rough surface on the piston at the exhaust side. That does not look promising when buying a Flash and I was wondering if only the Flash is using a different material for the piston or can I expect the same piston in the other new engines like the purple 35-plus-21.
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Old 07-11-2009, 03:14 AM   #157
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Roelof,

I just broke a Cordoba and found the same thing - scratched piston on the exhaust side

One thing I recognizedn when I disassembeled and checked the engine prior to break-in:

The piston was not pivoting (rotating) freely on the upper conrod wrist pin (Nova 04000). I thought it will free up during break-in, but it did not.
After 2.5 litres I disassembled the engine again and it was still not turning freely. It turned out that it was a tolerance issue. I changed the 04000 pin for another one and the piston rotated freely afterwards. I ran the engine for another litre of fuel right to the point where it lost compression. After I opened it up, I found the rough piston...

So keep an eye on this...
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Old 07-11-2009, 04:20 AM   #158
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Default Flash

We had a strange issue with a new Flash as well 09 production, sealed from the factory.

Did our usual thing prior to run in, stripped it to make sure it was clean inside etc (which it was), it felt a bit tight but we assumed it was just the layup oil.

Noticed it had been run from the factory, some light scuff marks on the back plate, strange but we continued on.

On re assembly the engine felt tight, stripped it again and then put it back together again and it was fine. Never, ever had this before with a engine....

Engine was then run in, and it's been used for a race meeting with no real issues.

I guess time will tell if it's going to go wooshca...

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Old 07-11-2009, 08:00 AM   #159
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I have broke-in 2 flash motors and I took them both apart and cleaned/oiled them before running. They felt a little tight to me as well fresh out of the box. I added 1oz of castor to each of the first 4 fuel bottles when I broke it in. Both motors looked perfect inside when done. I also added 1oz of castor to the rest of the fuel in the gallon to finish break-in on the track. Very happy with the results when completed. Motors look and run great.
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Old 07-11-2009, 10:01 AM   #160
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Quote:
Originally Posted by Dreddlox View Post
I have both of the engines and the difference is exactly as you stated. The 353 '09 is more of a top end engine better suited for larger tracks like 301 in Maryland where you need the legs for that straight, the 3SCT tuned is better suited for smaller tracks where the low end power it produces can be benenficial.
Try the new 2652. Similar performance to 2630 but better fuel efficiency.

http://www.rc-toro.com/product_info....oducts_id/1502
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Old 07-12-2009, 02:10 PM   #161
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Default Leaking front bearing

If an engine is not being used in over a week, how normal is it for the liquids (after run oil) to slowly seep out from the front bearing (Flash .21)?

This is a brand new engine where none of the bearings were removed.
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Old 07-12-2009, 02:15 PM   #162
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That is completely normal. If you take a brand new bearing and hold it up to the light you can see through them. They are not sealed.
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Old 07-12-2009, 03:09 PM   #163
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Cool thanks bud.
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Old 07-15-2009, 07:28 AM   #164
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Quote:
Originally Posted by silverM3 View Post
Try the new 2652. Similar performance to 2630 but better fuel efficiency.

http://www.rc-toro.com/product_info....oducts_id/1502
Not similar performance. It is better performance.
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Old 07-15-2009, 10:32 AM   #165
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Does the 2652 pipe have the same effect on performance when used with the 08 353 as when used with the 09 compared to running the 2630?
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