Competition marine engine

[RJaeken]

this is the current idea:



Gen 1 engine with P-pump , tst plate, 370injecors , 4000 GSK, 191 DV's, 16° timing.



Turbo's: twin garrett gt30R with . 63 turbine housing, 1 fed by cil 1 3 5 and 1cil by 2 4 6.



One massive water to air intercooler.



Expected horsepower 600.



I know you guys don't like these twin setups but some local turbo goeroes talked me into it.



Any comments?

 

[GO 4LO]

Personally, I'd start with a Gen 2 12-valve engine so you don't have to do a conversion to get the p-pump. If I understand what you're saying, you'll only have a single stage of compression. 600 hp is attainable with twins set up in parallel like this, but it's going to lag more than compounded twins.

What's the logic behind running 1 turbo off of 1 3 5 and the other off of 2 4 6 ? I'm not too familiar with parallel twins, but it would seem you could reduce header complication and runner length by running 1 2 3 and 4 5 6 ?

Chris

 

[Diesel Freak]

this is the current idea:



Gen 1 engine with P-pump , tst plate, 370injecors , 4000 GSK, 191 DV's, 16° timing.



Turbo's: twin garrett gt30R with . 63 turbine housing, 1 fed by cil 1 3 5 and 1cil by 2 4 6.

It's been tried with parallel HY9 turbos. It might work twin GT30R turbos, but it may be a little laggy, and you will need some major intercooling to keep EGT at sane levels.

 

[crawler]

I think that it'll be a bit laggy.



But with that said. You could probably make some good top end power, I would suggest more RPM or smaller housings on your turbos.



Later,

Wes

 

[sbentz]

Turbo's: twin garrett gt30R with . 63 turbine housing, 1 fed by cil 1 3 5 and 1cil by 2 4 6.







Any comments?

Check out the firing order. 1-5-3-6-2-4 would pulse one turbo, 3 holes in a row, and then the other. We have done a 2 turbo manifold, and the split needs to be 1-2-3 in one, and 4-5-6 in the other for balance. .



Might sound, cool though..... Chug, chug... ...

 

[RJaeken]

Sorry, my bad on the firing order.



If it doesn't spool quick enough, I'll NOS it in the beginning.

Why would the EGT's be higher with this setup?



I had a GEN 1 engine + the pistons are better suited to the 370 spray angle, not?

 

[Diesel Freak]

Sorry, my bad on the firing order.



If it doesn't spool quick enough, I'll NOS it in the beginning.

Why would the EGT's be higher with this setup?



I had a GEN 1 engine + the pistons are better suited to the 370 spray angle, not?

Boost pressure would be too low to pack enough air into the cylinders.

 

[NIsaacs]

It's been tried with parallel HY9 turbos. It might work twin GT30R turbos, but it may be a little laggy, and you will need some major intercooling to keep EGT at sane levels.

I may be all wet, but I never figured aftercooler/intercoolers give cooler EGT's under full power.





"NICK"

 

[RJaeken]

I may be all wet, but I never figured aftercooler/intercoolers give cooler EGT's under full power.





"NICK"

I had this same coment from lot's of people, because you coole the air, you put even more air into the cilinder resulting in more power but also more exhaust heat.



On watercooling the exhaust I also get mixed emotions.

Pro : better egt control

Contra : cooling is creating less flow



First try is going to be without any exhaust cooling.



How much boost you think the engine could make with this setup? If I ever want to be around 700HP crank, I would need around 55psi correct?

 

[1dslram]

The standard for a turbo charged diesel is that for every 1* cooler air into the engine will give 1. 4* cooler EGT's. How many parallel turbo set-ups are around? Let alone at 700HP. If I was you I would check with some proven engine builders, Enterprise, Piers, Schied, etc and let them advise you before you invest your time and money.

Bruce

 

[DieselNasty]

I was thinking wouldnt you want an pipe connecting the two manifolds so you get nice equal pressure? I was also thinking wouldnt 2 turbos that could flow the same air as one big spool up quicker? I have always been interested in a setup like this.

 

[bluthndr]

I was thinking wouldnt you want an pipe connecting the two manifolds so you get nice equal pressure? I was also thinking wouldnt 2 turbos that could flow the same air as one big spool up quicker? I have always been interested in a setup like this.

From what (little) I know about Supras (inline 6 gassers with like 1000 RWHP) the parallel twins spool faster, but the big (laggy) singles make the most HP... Seems like it would be the same with our "big" 6's.

 

[RJaeken]

The tube to connect the 2 is a good idea.



Normally, 2 smaller turbo's should spool quicker, even then the HX35.

If I compare a 530D from bmw with our engine, this 3. 0l spools from 1200 all the way up to 4600 rpm without lag. As our engine is almost 6L, 2 of these should do...



But I must say that I am having second thoughts and I think I will go with a proven setup.

 

[Diesel Freak]

The standard for a turbo charged diesel is that for every 1* cooler air into the engine will give 1. 4* cooler EGT's. How many parallel turbo set-ups are around? Let alone at 700HP. If I was you I would check with some proven engine builders, Enterprise, Piers, Schied, etc and let them advise you before you invest your time and money.

Bruce

What he said!!!

 

[Diesel Freak]

The Normally, 2 smaller turbo's should spool quicker, even then the HX35.

Problem is... . the GT30R is about the same size as a HX35. Depending on the combined exhaust cross section, you would get a high boost threshold RPM, and slow spool after that. Not a good idea in a marine application where you need instant spool and rapid torque rise.



If you want to see how much boost yopu can make with a pair of parallel GT30 turbos, look at the garrett website. They have compressor maps for the majority of their turbos.





www.turbobygarrett.com

 

[Diesel Freak]

here is the big GT30 compressor map.

 

[TractorNut]

Just to throw another idea out there. . how about 3 chargers in a Parallel-series setup... Something like the Super stock tractors are using???? Two feeding one big charger...

 

[Diesel Freak]

The thing you need to look at is the drag that is on a boat. It is much more than the drag on a vehicle operationg on land.



Even more drag than is on a Sled Pulling truck..... where drag is limited to traction between the tires and the dirt.



A sled pulling engine would work very poorly in a marine application.

 

[RJaeken]

I don't agree on the drag, once its on plane, it's less than a car. Now I can compare because I have a customers boat with a blown 540 chevy.

 

[Diesel Freak]

on plane is totally different than what it takes to get there. Before you are up out of the water, drag is huge.



A blown 540 chev big Block will crank out of the hole like a scalded cat... that is because it has the low end responce (assisted by the blower) to get the prop spinning, and lift the boat. You need some crazy fast spooling turbos to get this kind of responce from a diesel. Dont forget to factor in the added 200-300 pounds of engine.



What is the final drive ratio behind the 540? What prop are you running?



A good running B series with 600 crank HP will prolly have about 2/3 the rpm range of even a mild big block (as you know 600 HP is mild for a blown big block), so your out drive and prop will have to match.