Durham

[Dlmfan123]

Wasn't Overton one of them? Broke like 3 of them.

First 2 nights at golden isles both of there Durham motors broke

[zyoung25]

I count at least 4 of top 6 finishers had Durham engines. That is quite a good testament to the reliability of the Durham engine. Who builds the engines for Shirley ?

Durham with a bowtie

Carrier won at Richmond with one.

Knoxville is going to eat motors regardless of who builds them. It doesn't matter make or model, you can guarantee seeing several guys break motors there, or have some sort of problem. The place is more wide open than anywhere else they run, including Eldora.

[TackyTracker]

so who will be the next engine builder to tame knox??

[chupp n bloomer fan]

First 2 nights at golden isles both of there Durham motors broke

I think they’d mentioned not letting them warm up properly.

[Barbecueboy]

so who will be the next engine builder to tame knox??

Will be a hucky buck motor.......

[powerslide]

The better question is who in the top 6 didn't have a Durham under the hood? Sounds like they're doing pretty good to me. Any engine will blow if you over rev it. They're still running push rod motors in DLM, so that't going to limit their RPM right there. For the team who hurt motors, what kind of RPMs were they turning? How were they geared, and were they spinning the tires? That along with many other factors is going to be a factor in reliability.

Bloomquist seemed to of broke rocker arms on separate nights and we know he's not a up on the cushion banging and wheel spinning type. He has always spoken highly of Andy's maintenance free engines. All engines are ticking time bombs it happens to all of them at some point

[cjsracing]

Bloomquist seemed to of broke rocker arms on separate nights and we know he's not a up on the cushion banging and wheel spinning type. He has always spoken highly of Andy's maintenance free engines. All engines are ticking time bombs it happens to all of them at some point

On Friday night there was a caution in the feature, coming down the straight away from wide open to slowing for the caution there was a boom from Bloomquist's car then 2 laps later still under caution he pulled in. I wondered if the valve train broke when he let off the throttle from wide open. Kind of like a shock to the system of something.

[Stefan2k4]

On Friday night there was a caution in the feature, coming down the straight away from wide open to slowing for the caution there was a boom from Bloomquist's car then 2 laps later still under caution he pulled in. I wondered if the valve train broke when he let off the throttle from wide open. Kind of like a shock to the system of something.

A bang or pop when letting off the throttle is caused by the engine going rich for an instant as the throttle blades close in the carb. Fuel is heavier and more dense than air and therefore has more interia. When the throttle blades close in the carb, when a driver abruptly lets off, the air slows down quicker than the fuel. Therefore the engine will momentarily go rich. The extra fuel from this doesn't burn because it hasn't sufficient air to burn. So, it travels out the exhaust unburnt until it reachs the end where it encounter fresh air. Then it goes boom. This shouldn't cause any damage to the engine. However, if Bloomquist engine had already had a valvetrain component fail and was therefore missing on one or more cylinders as a result of this. It may have made this effect even more pronounced because there would be a lot more unburnt fuel coming out the exhaust pipes. So, it's also possible this may have been a symptom of a failure that had already occurred. Either way, I thing the pop or bang you heard was likely not the cause of the failure, but it may have been an effect of it.

Bloomquist seemed to of broke rocker arms on separate nights and we know he's not a up on the cushion banging and wheel spinning type

Yes, but wasn't he nearly a half second quicker in qualifying. Maybe he was hitting higher RPM that most others. Valve train is the weak link in a push rod motor when you rev it high. Maybe it's time to start thinking of overhead cam engines. Either that or go to larger displacement engines that will be geared high and not have to wind as high in the RPM range, maybe 500-700 CID. In drag racing, in the Pro modified division they have engines that go upto 1000 CID. Modifieds run big blocks, why could late models not?

[formercrewguy]

Modifieds run big blocks, why could late models not?

Yea.....and make em run a straight axle too!!!!!




smh.

[NormP]

Either that or go to larger displacement engines that will be geared high and not have to wind as high in the RPM range, maybe 500-700 CID. In drag racing, in the Pro modified division they have engines that go upto 1000 CID. Modifieds run big blocks, why could late models not?

Tim Logan and Steve Francis used to bring a Russell Baker big block to Eldora for the Dream and World. I always wondered why more teams didn’t do something similar.

[hucktyson]

How many worlds and dreams did they win with the big block ?? The answer is probably why more people didn’t do it ....