Stroker feedback?

[Gamester]

Hey guys,

So I see there are a couple of stroker kits out there for our 5.7 Hemis, 6.4L & 6.7L kits.

Has anyone here had these installed in their Ram? If so, how does it perform? What kinds of HP/TQ gains did you see? Did it affect reliability? Did it kill your MPG? Would it be safe for a supercharged setup?

Thanks!

 

[Gamester]

Does no one here have a stroker kit installed in their Ram?

 

[doz]

You posted all these "scientific" links in the header thread as to why shorties are better than long tubes..... So I know you research things.

Why in the world are you worried about a stroker motor right now? Honestly curious. You are talking about a stroker, but you do not have headers.

Next, why are you overlooking cam/heads? You are tearing into the lower end of your motor and have no need to yet. Increase airflow in the engine. You added a SC which is great, but the engine has so much more in it (as well as the SC when you open her up). To boot, you are already already packing in more air with the SC so just throwing a stroker crank in it wont be the same as on a N/A engine unless you want to turn down your boost.

That said, the easiest option is a 6.4L crank. Its been done by a few guys. Requires a little more than just changing out the crank. Then you will need to probably get it dyno tuned by someone who knows what he is doing. You were talking about money in the other threads (referring to the cost of long tubes) but here you are talking about dumping **** tons of money into a stroker..... In reality, a TRUE stroker will cost a good bit more than just the cost of a 6.4L crank/accessories and install.

A better question at this point is what are your goals?

I am also curious how you dyno out at 470 rwhp with just a procharger @ 5000ft.... You must have a very efficient drivetrain, almost unheard of.

 

[Hemi450hp]

Get in touch with Modern Muscle Performance for that stroker kit. They can set you up with anything from just a basic forged 5.7 to a full blown 449 aluminum block. More displacement is going to give you more tq, but if you are already that far in, you are also going to want to throw in a custom cam and ported heads. It is not going to be cheap by any means to do this right.

 

[Gamester]

You posted all these "scientific" links in the header thread as to why shorties are better than long tubes..... So I know you research things.

Why in the world are you worried about a stroker motor right now? Honestly curious. You are talking about a stroker, but you do not have headers.

Next, why are you overlooking cam/heads? You are tearing into the lower end of your motor and have no need to yet. Increase airflow in the engine. You added a SC which is great, but the engine has so much more in it (as well as the SC when you open her up). To boot, you are already already packing in more air with the SC so just throwing a stroker crank in it wont be the same as on a N/A engine unless you want to turn down your boost.

That said, the easiest option is a 6.4L crank. Its been done by a few guys. Requires a little more than just changing out the crank. Then you will need to probably get it dyno tuned by someone who knows what he is doing. You were talking about money in the other threads (referring to the cost of long tubes) but here you are talking about dumping **** tons of money into a stroker..... In reality, a TRUE stroker will cost a good bit more than just the cost of a 6.4L crank/accessories and install.

A better question at this point is what are your goals?

I am also curious how you dyno out at 470 rwhp with just a procharger @ 5000ft.... You must have a very efficient drivetrain, almost unheard of.

I'm just looking ahead and into all possible options to achieve my goal. My goal is to gain about 100 additional HP to get my 0-60 below 5 seconds while still maintaining my MPG; like my supercharger allowed me to do.

As far as my gain so far, the supercharger picked up about what I expected for my elevation. The Procharger kit adds about 150RWHP at sea level and I got about 120HP here at 5000ft which was to be expected.

I'll see where I'm at HP and acceleration wise after the TC and headers then go from there, but I would like to discuss all options which is why I'm here

BTW, how much HP do think just a 6.4L crank would add on it's own? I'm thinking a CI increase would be more MPG friendly vs big cams/heads alone; what do you guys think?

 

[kg93]

I gotta say, I dont think you can really keep big hp and good mpg in the same idea. The bigger the displacement, the more power you're making the less mpg you will be getting.

 

[RubberFrog]

*********, big boobs, small appetite- pick two

same with performance

 

[Gamester]

Yea I know, just need to maintain decent fuel mileage like with the SC as this is a daily driver.

Anyways, back to my original intention of this post; who here has added a stroker kit and can answer my initial post questions?

 

[Hemi450hp]

The answer is nobody. I can count on 1 hand the number of people I know with stroked 4th gens, and none of them are on this forum.

 

[Gamester]

Oh, ok; didn't realize it was such a rare upgrade.

Well, if anyone comes across this post in the future that does and can answer the questions, feel free to reply.

Thanks

 

[charonblk07]

There are several stroked 5.7L and 6.4L cars around me in my car club. The low end torque is better but you will NOT keep your fuel mileage. The engine can be reliable but they tend to have harder starting issues compared to stock, they guzzle the fuel a lot more, they will wear the block more and requires a rebuild sooner. Since you're already boosted you would want to keep the stroke small or you can start rocking the piston in the cylinder which is worsened by the higher cylinder pressures.

You can't just swap the 6.4L crank, you need to match the rods and pistons to the stroke so you're automatically looking at a complete rotating assembly. The 6.4L based stroker block I'm planning with my F1-A will keep the compression down to 9:1 with a set of Thitek heads and it's expected to take my boost from 16psi down to 9psi but the CFM increases drastically.

 

[Gamester]

Cool, that's the kind of info I was looking for! Yea, if it kills MPG that much and increases wear; I probably won't go that route with this daily driver. I'll see what kinds of gains I can get with some more basic mods first.

Thanks again