First aluminum duramax rod!!

paint94979

Beer Nazi
Sep 18, 2006
11,715
8
38
37
No. Simply because diesel fuel requires too much air to burn it, and it burns too slow. The best we can hope for is to catch up with gasoline engines, but that's a long way off.

So the fuel is the limiting area, I know this is off topic but it is there possibly a way to overcome this?
 

McRat

Diesel Hotrodder
Aug 2, 2006
11,249
26
38
64
Norco CA
www.mcratracing.com
So the fuel is the limiting area, I know this is off topic but it is there possibly a way to overcome this?

Audi is using custom made diesel racing fuel, and they are still limited to 6000rpm in a class that most engines are running 9,000 rpm. That's giving up 50%rpm to the gas guys.

Unless a new technology comes around that allows diesels to be efficient at high RPM's, they will never catch the gassers in that area.

But the good news is...

WE DON'T HAVE TO!

We can run far higher boost numbers than they can, and trade RPM for boost.

Getting 75 psi "clean" boost reliably in a diesel will make us competitive with the best of gas engines in the racing arena. But right now, even though some diesels run 120 PSI boost, it's often just superheating the air, so it's not making more power than 75 psi of cool air would make.
 

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
15,581
1,836
113
Mid Michigan
Diesels are special because how fast we can make the "slowest" vehicles on the highway. When I was growing up, a diesel pickup defined the term "slug". If you looked in the dictionary under slug, diesel pickup was one of the listings.

When you show up in a 3/4-ton pickup at the local dragstrip and wipe out Mustangs with it, it attracts attention. When they find out it's a diesel, their jaws drop. When you tell them it gets 20mpg and you can tow a 14,000lb trailer with it, they start to drool.

I have had this exact thing happen to me at the track. I would think most of us that run 12's or better have.

Audi is using custom made diesel racing fuel, and they are still limited to 6000rpm in a class that most engines are running 9,000 rpm. That's giving up 50%rpm to the gas guys.

Unless a new technology comes around that allows diesels to be efficient at high RPM's, they will never catch the gassers in that area.


We can run far higher boost numbers than they can, and trade RPM for boost.

Getting 75 psi "clean" boost reliably in a diesel will make us competitive with the best of gas engines in the racing arena. But right now, even though some diesels run 120 PSI boost, it's often just superheating the air, so it's not making more power than 75 psi of cool air would make.

Wait a sec. We get more power at lower RPM than gassers, dont we? A gasser has to run higher RPM to gain power, correct? So why isnt a diesel at lower RPM competetitve with a gasser at higher RPM, given equivalent power output?




Dont mind me...Im a hi-perf idiot. The truck is fast, but hell if I know how.
 
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McRat

Diesel Hotrodder
Aug 2, 2006
11,249
26
38
64
Norco CA
www.mcratracing.com
I have had this exact thing happen to me at the track. I would think most of us that run 12's or better have.



Wait a sec. We get more power at lower RPM than gassers, dont we? A gasser has to run higher RPM to gain power, correct? So why isnt a diesel at lower RPM competetitve with a gasser at higher RPM, given equivalent power output?




Dont mind me...Im a hi-perf idiot. The truck is fast, but hell if I know how.

Think of it this way:

How much fuel can you burn in 1 second? This defines how much power you can make. If you spin the engine faster, you can burn more fuel. If you can get more air in the cylinder, you can burn more fuel. 3000 rpm with 15 PSI boost is about the same HP as 6000 rpm with no boost, assuming the same engine size and running maximum fuel.

Here's a tip though, the more boost you run, the faster diesel burns. High RPM's want high boost. If 30psi at 3000rpm will make 500hp in a Dmax, then 75psi at 6000rpm will make about 2000HP if you get it dialed in. The fuel will burn twice as fast at 75 than at 30.
 

RPM Motorsports

smokinum
May 13, 2008
3,271
10
38
Central Valley Ca.
"You are lying because the customer was taken care of and did not ask for a refund, if he had he would have recieved it. True the block had 13 hours on it. With over 35 engines sold and one complaint i'd say that they got what they paid for. You know what you should be doing is asking BOTH parties involved BEFORE you ASSume your normal position. I have never seen a honest mistake turn into such defamation as you and your cronies have made it."


Wade, I have held this back long enough so im going to let it out. Anybody who knows me, will tell you im a lay'd back guy, and don't let anything get to me. This has been one of the things I let get to me, but kept my cool over it. I purchased an LBZ from you because of the low hours that were supposed to be on these blocks. I made a point to ask if the block was runable and had no major problems. You told me that it had a small ding on the front main cap. I was cool with this, because I have had major dings repaired in the past, and you said it would hone out. One cap was not an issue with me. It first started out with shipping the block, it took forever, but it was around the holidays and I let it slide. When the block arrived at the shop it was missing ALL of the mains, ALL of the rod caps, timing cover was cracked, water pump had a hole in it, adapter plate was missing about a 6"x6" chunk, the CP3 was smashed, Balancer was badly damaged, and the rods, with no caps, scored the crank durring shipping. I was pissed, but being the person I am, I let you know what was wrong politley. I waited over a month to get a set of rods, that looked like they were sitting outside for the last year, along with two main caps. One of the rods (Picture in previous post) had a cap that did not match. I called back, and you swore up and down that the rods were a matching set, and you checked them out personally. About another month later I recieved (5) more caps making a total of seven, obviously not from the same engine! A week later I recieved a single rod. I called and asked about the block and you finally fessed up and said another motor had fallen on it. I also asked about the block's visual, and you said you had left it sitting outside, because you didn't have the room. I cut my looses with the other parts (CP3, timing cover, water pump, Bal, Adapt plate etc.), because I had enough of your BS, not because everything was taken care of.

"With over 35 engines sold and one complaint i'd say that they got what they paid for"
Im sorry you look at your customers this way, as we don't see eye to eye on this. One complaint is enough, and I make sure ALL of my customers are happy whether I loose money or not. Yes, I have had a few take advantage of this, but the customer count grows faster when you gain trust. A customer that trusts you will tell his friends. A customer that get's burned, will tell the world! Knock Knock!!!

"You know what you should be doing is asking BOTH parties involved BEFORE you ASSume your normal position"
Wade, Pat spoke with myself then contacted you, so I think this was not an ASSumption!

One last thing, you should ask your rod mfg. how much HP/weight you could free up, if you left the rod caps out of the blueprints.
 
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