2.6 class with 13mm pump

GOT-Torque said:
I thought this was the situation where 13mm pumps have reliability problems (being turned all the way down)?

Which is why I thought someone might be better off running a maxed out 12mm pump with a quick fill cam. Plenty of fuel for the 2.6 class, support higher rpm, and no reliability issues like a 13mm turned all the way down would have...

I could be way off though and would like to hear others opinions on the reliability of a 13mm pump with the plate all the way back...

What problems actually occur? wiping a pump shaft lobe... sticking a plunger in the barrel... anything else?
Click to expand...

IMO None of these can occur whith the plate set all the way back, if you tear up the cam it is beacuse you are running to small of a stick or lines that are too small you are not letting the pump displace all the fuel which is being delivered (Post Pump Pre injector) which creates a fuel traffic jam causing prematue cam wear...... U need to cut the fuel with the rack travel not choking it with lines or small sticks.
Sticking a plunger would be a lack of delivery of #2 to the P-Pump......

Also RPM is key to these 12V's IMO and with that u need FUEL AND A FAST DELIVERY RATE, it is the only way to compete with these Commonrails (Wesley Wade) Duramaxes (Evan Davis) to name a few of these contenders in my area.
Brandon
 
Last edited:
even schieds will tell you that a 13mm pump is not reccommened for the street. It is just like boring your motor out bigger, The bigger the plungers the thinner the barrel and more exceptable the heat induced problems which can also be caused by poor fuel quality, lack of supply from feed pump, and as 97ctd mentioned, the fuel traffic jam after the pump. That is why i say a 12mm is fine for the 2.6 because 2.6 is a streetable setup. Tim
 
My mistake, I was thinking about people who streeted a 13mm pump with it turned down (which included running smaller injectors too). You are correct though, the bottle neck that creates problems would be downstream of the pump.
 
I didnt mean to make any body mad, but 13mm p&b's are competition use p&b's. Besides a 2.6 tubo will have plenty of fuel with a 450-550cc 12mm pump. The reasons people think they need faster injection rates is because the pro mods do it. A Sygma will inject the same fuel faster so less timing can be run and the fuel will be injected at the right time. If you have to run 40+ timing to get all the fuel in the cylindar, you need a bigger pump. The pro mod way of thinking for a 2.6 street class is overkill IMHO.

Tim
 
Hey not to change subjects here but does anyone know where there's a video of the black crow dodge? I hear it was sold up here in wisconsin but still havn't seen it or seen a video of it.
 
Do a search for Missouri State fair. I think he is a member on CompD also.
 
97' CTD Also RPM is key to these 12V's IMO and with that u need FUEL AND A FAST DELIVERY RATE said:
Wesley Wade[/B]) Duramaxes (Evan Davis) to name a few of these contenders in my area.
Brandon
Click to expand...

You are in a bad area, it seems like anymore at most of the pulls around, all you see are duramaxes.
 
The fuel traffic jam your talking about is called hydraulic loading. Running too small of injectors and fuel lines will cause excessive hydraulic loading. This will wipe out camlobes, lifters and will cause plungers to stick/sieze. We are/have been making a 2.6 turbo that we backcut the compressor cover to the 2.6 size. We use a S480 or a S474 with a med. to smaller A/R turbine housing for great spoolup. This allows you to use more of the 13mm pump than you may have been before. A Sigma pump is a awsome pump. But found out that it does not put out any more fuel than a 14mm pump that we sell. The 14mm pump is too big for most people unless you cut the rack back. .120" lines and very big injectors need to be used with the 14mm pump. We have made 10x.016" injectors with extra lift cut and duel feed. This would be the size for that big 14mm pump. Sigma pumps can be fitted with larger plungers but are usually not. We have the large foot exhaust manifolds in stock that fits the S480/S474 turbos as well. Thanks, Brady
 
Last edited by a moderator:
I realize that this is the sled pulling section, but has anyone here gone from a 12mm pump to a 13mm pump for drag racing? I would buy one just to put on a few times a year for some of the events if I was sure it would help. I don't see over 3500 rpm though.
 
TopFueler said:
The fuel traffic jam your talking about is called hydraulic loading. Running too small of injectors and fuel lines will cause excessive hydraulic loading. This will wipe out camlobes, lifters and will cause plungers to stick/sieze. We are/have been making a 2.6 turbo that we backcut the compressor cover to the 2.6 size. We use a S480 or a S474 with a med. to smaller A/R turbine housing for great spoolup. This allows you to use more of the 13mm pump than you may have been before. A Sigma pump is a awsome pump. But found out that it does not put out any more fuel than a 14mm pump that we sell. The 14mm pump is too big for most people unless you cut the rack back. .120" lines and very big injectors need to be used with the 14mm pump. We have made 10x.016" injectors with extra lift cut and duel feed. This would be the size for that big 14mm pump. Sigma pumps can be fitted with larger plungers but are usually not. We have the large foot exhaust manifolds in stock that fits the S480/S474 turbos as well. Thanks, Brady
Click to expand...

So how much hp can I pick up if we ditch the Sigma and go with a II 14mm pump??LOL
 
No one has used all the fuel available yet. You would need a bunch of air to use the fuel that our 14mm puts out. Talk to Shane at II, he is our turbo guru you might say. He knows turbos very well. It would be a BIG single or more probable a large set of twins. For all of us doing BIG fuel, the air at these levels becomes harder to obtain. If you reread my post I said that Sigma pumps are awsome. Not many people have used all the fuel that they deliver either.
To answer your question, I would need more information about what you are running now and what hp you have made. Thanks
 
504 ci 200 psi boost 2400+ hp

So how much does your 14mm pump flow and how many degrees does it take to do it??
 
I think what Brady is saying (not trying to put words in your mouth) is that no one is using the capacity of the 14mm pump. Honestly, none of the Mod trucks were using the 13mm pump to it's fullest capacity, most are USING around 800-900cc.
But, with a 13mm pump you are stretching out the duration of the injection cycle to achieve the same amount of fuel charge (slower injection rate)
So with more available fuel (and proper spec and tuning of ALL system components) you are able to deliver the same amount of fuel or more, in much less time, which will (again when setup properly) increase horsepower and torque and lower exhaust temps, to put it very vaguely.
So IMO, a 13mm pump, setup properly, would be a good match to a purpose built "2.6" charger truck.
 
Last edited:
So what size plungers does a sigma come with, the ones I have seen are 16mm.

Also, TopFueler, are you guys building pumps or do you have the ability to get pump parts?
 
SuperSonic said:
So IMO, a 13mm pump, setup properly, would be a good match to a purpose built "2.6" charger truck.
Click to expand...

Right on Chris!!! I agree. I noticed a huge difference from my II 535cc pump to a 13mm Scheid pump at 525cc's. This is not an II bash. The pump I FINALLY got that was right worked awesome from II. Just took 3 pumps to get it right. Truck ran MUCH better with only that change. Then added bigger sticks and it just kept getting better. If I could only have gotten that timing just right!!
:bang
 
You must log in or register to reply here.
Back
Top