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Old 05-07-2012, 11:53 AM   #1 (permalink)
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best poly syle bump stops

We are currently running EVS 5" bump stops in the front of a YORR stock mod class scrambler. the performance is fantastic but they are only lasting about 1/2 a season.

The regular poly stops would not even last one race. Air bumps are out due to class rules.

Is there another poly style bump stop that will last longer with similar characteristics to the EVS?
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Old 05-07-2012, 01:03 PM   #2 (permalink)
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Old 05-07-2012, 06:55 PM   #3 (permalink)
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Have a pic?
Add 2" of steel and use 3" bumpstops.
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Old 05-08-2012, 07:41 AM   #4 (permalink)
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Not familiar with EVS bumpstops but I've had good luck with Daystar polybumps (lifespan is 3-5 abusive races). The key is to make sure the bumpstop has a flat/smooth surface to smash against. Daystar makes a canister style bumpstop where you can easily add/replace poly inserts and play with different levels of softness. They are not cheap and many guys opt for just going with a good air bump for a little more money.

Another cheap option: Find some Ford Superduty F250 yellow bump stops. They are tough as nails.
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Old 05-08-2012, 08:34 AM   #5 (permalink)
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here is a pic of the daystar evs which has been holding up pretty well for about 1/2 a season

also a pic of the regular comp style poly that are shot after one race.

the landing pad for the bump stop is smooth and flat but the tracks of course aren't so the bump stops are getting side loaded on off angle hits but there isn't any way to avoid that.

canister style and air bumps are not allowed in our class.

The evs is the smoothest bumpstop we have had on it and will probably stick with them and just consider them a consumable part.
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Last edited by axleater1; 05-08-2012 at 08:35 AM.
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Old 05-08-2012, 09:11 AM   #6 (permalink)
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1970 Datsun Pickup "Helper Springs" work awesome if you can find them. Rubber "Figure Eight" that everyone from Walker Evans to little ol' me used back in the day before hydraulic/air bumps. Mid 90's Pathfinders also have a smaller version that we ran on 1600's and 9 cars.
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Old 05-08-2012, 10:05 AM   #7 (permalink)
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Quote:
Originally Posted by axleater1:14339639

canister style and air bumps are not allowed in our class.
Not quite only air or hydraulic bumps are not allowed. Doesn't say anything about canisters. Jason said the figure 8 work really well. You going to the meeting tonight?
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Old 05-08-2012, 10:42 AM   #8 (permalink)
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we have the figure 8's on the back and they are working awesome but they are too tall for the front.

the canister style poly bumps have not had an impressive showing so far. looks like they heat up under race type conditions swell up and then get stuck which leaves you with nothing more that a solid metal bump stop.

Last edited by axleater1; 05-08-2012 at 10:45 AM.
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Old 05-08-2012, 12:10 PM   #9 (permalink)
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Quote:
Originally Posted by axleater1:14340261
we have the figure 8's on the back and they are working awesome but they are too tall for the front.

the canister style poly bumps have not had an impressive showing so far. looks like they heat up under race type conditions swell up and then get stuck which leaves you with nothing more that a solid metal bump stop.
Where are you getting that from? I thought I saw that the jeepspeed trucks running them and were working well? Maybe they will chime in.
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Old 05-08-2012, 12:21 PM   #10 (permalink)
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the only 2 sets that i haver personal experience with basically locked up. If other teams are making them work i would like to hear about them. These were also some of the first sets out there so perhaps they have made some changes.
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Old 05-08-2012, 12:25 PM   #11 (permalink)
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Well I might have to retract that. Most searched to think that real bumps are better for the cost. Does Brian have bumps on his shock shafts?
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Old 05-08-2012, 02:46 PM   #12 (permalink)
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I hear from a well respected builder that Late model (2004 ish) Factory GM Silverado 2500 rear bump stops are hard to beat
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