Internal Bypass

[racer951]

I know what external bypass is and how it works but how does internal bypass work, how much different is it than external, how is the adjustability and can you retrofit any shock with an internal bypass sleeve?

[FABRICATOR]

There are different types of internal bypass shocks. Some are double wall construction with ports through the inner wall for passing fluid to the cavity between the walls. Others have ports through the piston with corresponding tapered rods protruding from the shock ends. Fox has a patent on a double wall design. Either of these can work well but are not as easily adjustable as the external tube type. There are other types as well but these two are the most popular. Their main advantage, of course, is that they can hold a coil spring. Never heard of any retrofits.

[racer951]

my purpose would be to use one on a class 9, not to run colis on them as well. I heard Lothringer can put sleeves in them but I am not sure. Is it much better than just a standard emulsion as I would assume?

[TimHayosh]

Lee at RaceShock Co. (http://www.raceshock.com) can also hook you up with bypass sleeves for Foxes. Don't know of any other brand name with a bypass sleeve.

[racer951]

any more info on how much it helps?

[shower]

Since they are for a class nine, talk to Kevin Bunderson in Vegas. He has been sleaving Fox's for class nines for a few years now. He would have the best handle on what works best.

[Dylan]

I’ve built a couple of sets for people

Fortins class 1 front shocks

Jeff Kincades CORE Toyota

Dane Cardone’s yellow F-150

On the compression stroke for big hits there great!!!! It is however a little difficult to get the low and medium speed control that you would want for more conservative driving when your not using full travel all the time but it can be done. Also for the rebound pack zone you need to rely on high charge pressure to keep it from cavitating above the piston. They also require a lot of work to dial in because you have to tear them down every time you want to make a change and some changes require making a new inner can.

It’s not the ultimate shock for all applications but for big hits and the ability to set it up to never!!! Totally bottom out its cool. Just like all the other cool shock stuff like shaft clickers and tapered meter rods its not that cheep and easy to manufacture.

If you were to run a coil over and a bypass anyway you could make the coil over the never ever bottom totally progressive compression only shock and set up the bypass for low to mid speed and rebound primarily.

There are other ways to get position sensitive in a coil over also

[GregC]

Hi

Dylan, what other ways are there to get position sensitive ina coil over shock. Would it be adjustable? An internal bypass shock would be perfect for the car I am building.

Greg

[obr184]

while we are mentioning kevin bunderson- does anyone have an email for him?

[artjr979]

Lothringer does do it for about $175 a pair if you have the shocks already. You need to call him for details on what measurements you need to take so he can sleeve them. We loved those shocks on our 9 car 1600 & 10 car, alot cheeper than tubes just not adjustable.

[shower]

[ QUOTE ]
while we are mentioning kevin bunderson- does anyone have an email for him?

[/ QUOTE ]

I don't know if he has email. Here is his contact info:

Bunderson Racing
3028 Contract Ave
Las Vegas, NV 89101
(702) 382-3375

He is a great guy and very sharp. He really know his stuff regarding suspension.