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Differences Between SRT-4 Long Block and 2.4 Longblock


 
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MoparOso
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Post: #1   PostPosted: Fri Apr 01, 2016 2:44 am    Post subject: Differences Between SRT-4 Long Block and 2.4 Longblock Reply with quote

I just picked up a SRT-4, and I want to source a core long block to start building my engine. I imagine the SRT-4 head has larger valves and ports, but I wanted to be clear as to whether or not I can use a 2.4 block to build for a SRT-4 engine.
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dbesade
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2005 Dodge SRT-4

Post: #2   PostPosted: Fri Apr 01, 2016 6:02 pm    Post subject: Re: Differences Between SRT-4 Long Block and 2.4 Longblock Reply with quote

MoparOso wrote:
I just picked up a SRT-4, and I want to source a core long block to start building my engine. I imagine the SRT-4 head has larger valves and ports, but I wanted to be clear as to whether or not I can use a 2.4 block to build for a SRT-4 engine.


Same Block/head castings with some differences:


    1. inconel Exhaust Valves
    2. Oil Jets for the piston skirts
    3. Rods/Pistons
    4. Oil Pump
    5. Cams
    6. Oil Cooler


I can't remember what the other differences are but that is a really good start.

-Dave
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occasional demons
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Post: #3   PostPosted: Sun Apr 03, 2016 6:37 pm    Post subject: Reply with quote

SRT cams are the same as any old 2.4 set.

The SRT/PT oiling system is the best fit in a 2gn neon, and only the SRT/GT pump is available from Mopar, so that is not open to too many options.

Only the NGC blocks can be used to convert to SRT specs, and to mount the half shaft bracket to, if using the T850. Otherwise you will need to fab a bracket, and run MS/similar. The blocks can come from any FWD Mopar, but must be NGC to use the factory PCM.
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JeffB#2
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Post: #4   PostPosted: Wed Apr 06, 2016 3:52 pm    Post subject: Re: Differences Between SRT-4 Long Block and 2.4 Longblock Reply with quote

MoparOso wrote:
I imagine the SRT-4 head has larger valves and ports


Nope. Smaller valves on intake and exhaust sides compared to '95-'00 2.0 DOHC and 2.4 heads. '01-up heads flow less than the older heads in part due to the sharper radius of the port on the way out. No one seems to mention that these days.
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Post: #5   PostPosted: Thu Apr 14, 2016 8:28 am    Post subject: Reply with quote

I have read about the exhaust valves being smaller, no one mentioned the intakes too. I knew the ports were different, but wasn't sure if that affected flow in itself.

I tried to persuade my brother to convert the IM pattern on an older DOHC head for his SRT swap, but he decided to keep it as it came from the factory.
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robertwilk1991
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Post: #6   PostPosted: Tue Aug 02, 2016 11:51 am    Post subject: Reply with quote

So question, how different is the flow with the cirrus head different from the srt4 head? And would it be a simple task of just putting set valves, springs, retainers etc. In a cirrus head? Sorry if I'm askingthe retarded questions here.
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Mr One World
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Post: #7   PostPosted: Wed Aug 03, 2016 3:26 am    Post subject: Re: Differences Between SRT-4 Long Block and 2.4 Longblock Reply with quote

JeffB#2 wrote:
Nope. Smaller valves on intake and exhaust sides compared to '95-'00 2.0 DOHC and 2.4 heads. '01-up heads flow less than the older heads in part due to the sharper radius of the port on the way out. No one seems to mention that these days.



You can put the larger '95 - '00 valves into an '01 up, but probably still won't flow quite as well as the older heads.

As far as stock SRT are concerned, it wasn't an issue. The turbo more than made up for the flow differences. Those are more important when relying solely on atmospheric pressure to push air into the engine. Boost gives you a fair amount of fudge room.

Improving flow only adds to the icing on the cake.

It doesn't matter what car the head came from, but the model year it was sold as.

The IM can be redrilled to work with the head used. But for optimum performance in a factory stock head, the '00 older has the edge.

There is of course the vent hole issue, but that is also a minor work around, if you aren't too anal about it.
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INVUJerry
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Post: #8   PostPosted: Wed Aug 03, 2016 1:26 pm    Post subject: Reply with quote

If you find an 03+ PT GT or turbo lite motor they'll work fine.
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