What are you guys doing for run time with the extech .21. I'm running the bigboy pipe in buggy and can't seem to get 5-6 min max. Any help would be appreciated.

The big boy pipe sucks a ton of gas. The best pipe for that engine for power plus fuel is the 2013

Get the trinity phat head amain hobbies should have them

i have an old trinity extech for sale 50.00 it has a good case and p/s and pretty good condition conrod and a good crankshaft just no head or bearing

You can use a nova head as well. Its a direct fit.

WTF???

The Big Boy or Bat pipe sucks all around IMO.. Get a 2013 or 2057. 2013 has much better bottom end, suited for a truggy, and the 2057 is more of a top end pipe with better fuel mileage / buggy.. 10 could be doable with a light trigger finger, and the 2057..

lol sorry I had just got up from a nap. Lol. Thats funny

LOL I thought so to.. Jsut giving you a hard time..

what other conrod fits .21 extech?

http://www.amainhobbies.com/product_...ine-Turbo-Plug

same motor the rod will fit when they get them. Someone also said the Werks B5 and Sirio Evo 4 rod will work also. I have a Extech II .21 rod I changed after break-in it is almost new.

does your sirio that i drove sat. in your OD buggy not have the same rod?

i have a friend that has a sirio evo3 rod and i wonder if it would fit...

the sirio engine in my OD buggy is the BK Kanai Evo4 STI.. I just need a new rod for my gen1 Extech EB full mod engine.. the thing is crazy fast :nod:

faster than the one in your OD? and man i loved your buggy, i think i liked it more than your D8 i used lol i think i could of won the money race with your OD, it was dialed :nod:

i wish i still had my extechs, i would of given you mine, it had 3 gallons on it, i hated it lol

both engines are pretty similar in power and speed.. the extech engine came alive with the RB carb.. as far as the OD buggy., yes it is dialed. i have put a lot of time finding a good a setup, your dad should copy my setup... i also think that it handles better after i moved the rx batt back 5/8" of an inch...

Anyone have the silicone insert in the crankshaft fall out of their ExTech .21?

Mine did. I found chunks of it between the sleeve and case. Caused me some tuning problems to say the least.:weird:

I cleaned out the motor and removed the chunks of silicone. What will this do to the performance/runtime of this motor, lacking the insert?

Runs great now that I figured out what was going on. It rips now, idles without stalling, and then doesn't load up/stall when I grab a handfull.;)

Anybody?

just about everyones did. and you can take it out and youll loose about thirty seconds of run time, the tune will change some but thats about it. seen a bunch of people do it.

Thanks for the info. Losing 30 seconds of runtime ain't no biggie. I was getting 10 mins with the AE 2035 pipe in my buggy anyway.:)

my sirio kanai evo4 sti lost the silicone insert and it didn't make any difference with the tuning nor the run times., still as fast as a raped cheetah! :D

OMG that one for the three main problems with these motors others are cooling head and carb. The ramp isn't a issue run it as is save your money don't fix it you wont see a difference.

Also if anyone needs a brand new cooling head Extech NIB let me know will sell cheap.

So the piston and sleeve will also fit in the extech's

Yes.. Bur keep in mind that the Bore and stroke are slightly different between the 2 engines.

so... what happens if you use a slightly shorter conrod in your engine?

I think the sirio ,orion , werks ,use the length rod right now i'm using a sirio evo 4 sti p/s ,rod,case and a werks b5 crankshaft and engine runs good. Will see if any better or worse when i race this weekend.

Thanks for te info mate!...., i guess that i will get the kanai3 engine rod from my friend..

The Rods are the same length from Sirio & Trinity.. But, rod length Does not determine your Stroke.. The Crank determines your Stroke..

The answer to your question, how ever, is it will change port timing.. Which could be good or bad, depending on which way it changes, and depending on your driving style.. I'm not a tuner, so I don't know which way will do what. One, thing I do know for sure if you only change the crank to a shorter stroked crank, you will loose some compression, same would be true if using a shorter rod.

sirio cl7 sti and the evo4 sti use the same rod [ same part number]it all about the crankshaft stoke. I gained the compression by removing a shim and i will watch it close. Not for beginers. 16.62 evo vs werks b5 16.50 crankshaft

Has same bore and stoke so it should fit.

And the rod is the same size if so im gonna order a re-generation kit but not sure which one to order cuz there are 2 different one's on team epic/team trinity website

Port timing will be your only achilles, and depending on which way it moves it, it might actually fit your style of driving better..

I have a STi Evo 4 that needed new crank, I have a werks B7 I was considering swapping into, it, but decided against it, becuase none of the modders or manufacturers would give me any idea how well it would work.. one said it coudl either increase bottom end or loose bottom end.. Considering I wanted more, it was a gamble I decided against.. I ended up with a nice used RB S5, and am glad I got it..

Trial and error, my crank is wearing at the pin on my evo4 so that why am trying the b5 crank because its close .You cant find part on a sirio 4 sti anymore and the b5 crank has hardly no wear so what the hell.BTW the evo4is the best engine I have ran.I wished they still made parts for that engine,very smooth and powerful at the same time.

+1 my evo4 sti engine is bad as hell.. but my eb full mod extech runs awesome as well. :D

We re-fill the cranks on a lot of Sirio trinity engines, They are notoriuos for the epoxy coming out. We charge $15 you can run it without, like another member stated ,but it will run better with the epoxy in. With the epoxy out it enlarges crankcase volume, so you will lose responsiveness and a bit of runtime.

Lance,
Rcrenew.com

One of my Evo4's is doing this as well, which is why I was considering using the Werks crank as well.. BUt you will have to run a Werks Rod.. And, I am not sure if the wrist pin is sized different from sirio to werks or not.. So just beaware that you might waste the $75 for a rod for nothing..

What carb can I put on the trinity extech

i use the RB carb and it works excellent!

Ok cool thanks

Ran the combo had very good low end but the top was not very good.Was very weak on top.it had good fuel milage though.:ha: Btw the evo rod on the b5 crank was fine. still I will mess with it some more with the shims.Mad man at work

That is Odd.. But the Werks crank I have is a B7pro.. But the Crank pin is substantially smaller..

If it is making really good bottom end, then you mght just try to gear it up, and keep RPM's low.. Also try a Top end pipe if you have one, should help a bunch..