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Old 08-28-2007, 03:03 PM   #1
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Default What is a good pipe for the Radical 621T

Just like the title says....any suggestions?
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Old 08-28-2007, 08:08 PM   #2
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TTR 2035 long pipe w/ smooth flow manifold
http://www.amainhobbies.com/product_...oducts_id/4637
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Old 08-28-2007, 08:45 PM   #3
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Radical sells an adjustibe pipe for thier engines. I have one for sale, used in good shape. $45 shipped PM me if interested
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Old 08-28-2007, 09:07 PM   #4
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The Radical pipe is the best for power/fuel mileage, I have heard some good things about JP3, any 053 pipes, The JP will give you plenty of power but the mileage is not good. so I guess it depands on what you are after..the nice thing about the Radical is you can adjust it for different track conditions.
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Old 08-28-2007, 09:12 PM   #5
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I had a buddy that had the Radical pipe and didnt like it, but its all a perference.
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Old 08-28-2007, 09:30 PM   #6
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I run the 621T with the Radical pipe.....1 big shim....1 small shim. I'm running 30% TQ Fuel and can usually get close to 9 min of runtime with temps no more than 220......on a really hot/humid day(100 deg.+). And yes, it has more power than most people know how to use.
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Old 08-29-2007, 02:14 AM   #7
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I ran the JP3 for about 2 gallons on my 8ight, it ran well with a tank lasting about 8 minutes or so. The motor is a handful, have fun.

Chris
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Old 08-29-2007, 04:13 AM   #8
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I ran an 053 w/ a JP round manifold. I was getting close to 10 mins to a tank and it was a beast. I have a werks B7pro now and the radical was quicker. The regular 053 was ok, so was the JP3, but the JP1 was actually better than either. But when I combined the 053 and the JP3 manifold it was an animal with great mileage.

It was the best motor I've ever owned just keep a close eye on the connecting rod after 3 gallons, mine let go just before the 4 gallon mark and took the entire motor out. Knowing what I know now I would have replaced the rod at the 3 gallon mark and still be running that motor.

Side Note: The B7 pro is a great motor it has a very smooth power band, but the radical was just insane out of the hole, almost too much.
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Old 08-30-2007, 02:46 AM   #9
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There is a new and improved rod. The old one did not last long. I have 2 gallons through mine and changed the rod last night. The one that came in the motor was toast.
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Old 08-30-2007, 11:16 AM   #10
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Quote:
Originally Posted by sracer View Post
There is a new and improved rod. The old one did not last long. I have 2 gallons through mine and changed the rod last night. The one that came in the motor was toast.
That right there is why I am only going to buy a motor from a major manufacturer. Between the rod on my 621 (it was actually a fantom), and the crank on my B7 (which they took care of) I'm done being a gineu pig.
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Old 08-30-2007, 01:29 PM   #11
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I don't know about any rod problems....I've got a 621T with approx. 8gal on it and a 621P with about 5 on it, and haven't changed a rod on either of them. And yes, they both still run perfectly.
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Old 08-30-2007, 04:42 PM   #12
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I was told by a sponsored radical driver that I should check the rod after a gallon or two and get the new rod and put in it. The new batch of motors should have the new rod in them so you don't have to worry about it when they come off back order.
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Old 08-30-2007, 06:44 PM   #13
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Ok guys,
there is no new rod, the only difference is the newer ones have been milled a bit more to make them lighter. same material, ect.

The team driver that told you that was correct, the rod should be changed after the first 3 gallons (6 hours run time) this is not due to bad material or a defective rod, this is very common for race engine. The reason for this is the tight pinch they come with, break in can be very tough on a rod, and lets face it most guys will never wait a full 20 tanks before going full throttle.

I have an engine that has 13 gallons on it with the original rod still in it, I also have one that has over 5 gallons on it .

There are alot of things that come into play with an engine that is turning 42,000 RPM.

Also if you read the insert in the box it says "replace the rod after 6 hours of running"

hope this clears up some stuff. feel free to PM with with any questions.
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Old 08-30-2007, 07:03 PM   #14
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Your so smart......I told ya'll..............good stuff.
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Old 09-05-2007, 04:41 PM   #15
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very powerful engine - almost too much bottom end for a buggy (at least for me!). I did not like the radical pipe on it...a jp2 (of all things) gave a much smoother powerband and more top end - as always, these mills like to come off the track around 205 or so..amazing that they run so cool
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