Johnny93 Posted April 25, 2022 Share Posted April 25, 2022 Has anyone put bigger injectors in a 2VH EM6-300? I’ve pulled the heads to replace head gaskets and fire rings. It’s going back together with head studs, I’m debating sending the injectors to a guy to have them worked over a bit and putting a little bigger turbo back on it for some extra power. Does anyone have any thoughts/info on this? How much hp are these engines good for? Quote Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/ Share on other sites More sharing options...
fjh Posted April 26, 2022 Share Posted April 26, 2022 The block is mostly maxed out as is ! 350 at most you try to pull more your poking a bear with a stick! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/#findComment-496098 Share on other sites More sharing options...
67RModel Posted April 26, 2022 Share Posted April 26, 2022 Yea I was going to say the highest factory rating you ever really saw any Mack engine(excluding E9) prior to the E7 was 350. The introduction of the E7 and more specifically VMAC probably is what allowed them to go above 350. You are also kind of limited with the 2 valve head...... Quote Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/#findComment-496099 Share on other sites More sharing options...
Popular Post AZB755V8 Posted April 26, 2022 Popular Post Share Posted April 26, 2022 There are a lot of "ifs" to consider with getting more power out of a factory rated engine. Tons of time has be engineered into them for power, durability, reliability, etc. Knowing this I went to Mack, years ago, to get a few answers from the master engineer of the E9, Steve Trevitz. Haven't talked to him in years "retired" but getting more out of an engine usually takes little for a 50-75hp/250-300 torque gain. That is all you should be looking for, because "tweaking" causes other issues. Standard injectors are fine for this gain. I can say that the the Military/Marine Mack injectors are for 200hp plus gains with a lot of other modifications. All that you need is a new S300 Borg Warner turbo, same size as what you got. Turbo technology over the last 25 years is incredible. You will get a lot more boost out of it. Have your fuel "at a pump shop" increased 15%. Maybe add a few degrees timing. Pyro gage, That is all. Along with head studs a light right foot and keep an eye on coolant temp, cracked heads will happen with heat. NO stabbing the throttle, epecially unloaded, you will snap the crankshaft. Have a good clutch and just you driving it, not a multi-driver engine now. Guys get drunk on power and this engine will have a very short life. 4 Quote Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/#findComment-496106 Share on other sites More sharing options...
theakerstwo Posted April 27, 2022 Share Posted April 27, 2022 That engine was easy to twist the crank line bore out of aligment when getting more power than factory. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/#findComment-496131 Share on other sites More sharing options...
AZB755V8 Posted April 27, 2022 Share Posted April 27, 2022 Just now, theakerstwo said: That engine was easy to twist the crank line bore out of aligment when getting more power than factory. Yes, as I said "tweaking" causes issues! Junk that engine at that point. It is a lot harder to do that to an E9 but plenty of those got junked from turning them up to far. Ever seen one pop head bolts? Not hard to do. Quote Link to comment https://www.bigmacktrucks.com/topic/69606-oversized-injectors/#findComment-496133 Share on other sites More sharing options...
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