<~~~*strokes his rod while thinking about GTM's rods in the stroker kit.*

 

Dirty old man.. I didnt think you could get it up??

 

 

lol. I'm not that old. Sometimes it gets so hard, so fast....it jerks me clean out of my chair. lmao.


That is f*ckin hilarious!!! lmfao.

 

Good work Sam!

 

very nice job cant wait to see final numbers

 

 

Great work.

Hope to see the car soon.

M

 

Impressive build projects and power numbers on both cars! Like the others, I look forward to seeing the dyno results with 24PSI.

But I can't help but wonder and ask if running 24PSI on a motor bored and stroked to 4.24 liters is pushing the limits of the block? Is 24PSI really safe and reliable after increasing the displacement that much?

From what I've read, it isn't recommended to run 700+whp on a 3.5L without sleeving the block.

So Sam, what do you think is the most PSI you can run safely and reliably with your stroker kit?

 

I dont think you need to run a sleeved block until you get to the upper limits of 650-700, maybe a tad bit more. Sleeving is just for security reasons, but knowone has had a block fail due to sleeving. Even the ones that have made over 700hp

 

I think you misinterpreted what is said. I intend to get my block sleeved when I get my motor built. I wasn't suggesting that sleeving would cause the block to fail. I have concerns/questions about running high boost levels on a VQ block that has been both bored and stroked out to 4.24 liters.

 

Wow...I'm another guy waiting to see where this goes with some higher PSI. Curious as to what it would do NA as well...

 

Well done sam... just like the otheres can't w8 to see the 24 psi #s

 

Sam's stroked engines have Darton MID sleeves, so I would think this alleviates the question as to loss of structural integrity when doing the overbore.

You can check out the first post in Sam’s thread https://my350z.com/forum/showthread....224931&page=11

 

the question is can the structure of the block handle 24 psi reliably? I didn't know the issue of head lift was solved without some internal reinforcements

 

Thanks

That does alleviate my concern about the block. I checked out the link... that kit looks awsome and it's potential sounds promising.

 

Yea, I guess that is a good question. I don't think anyone has an answer to that at this point. The follow-up to that is what is a definition of reliable? I have to guess if you run your car hard, for an engine like this to last 2 years before a teardown for inspection would be a good bet.

I would also guess that 'most' people would not run their car on that boost level as it would be pretty difficult to control on the street. 24 psi would be a 'Race' map designed for race gas, short bursts and specific situations; not to be used on the street under daily driving conditions.

The people I have talked to say generally they run between 12 - 16psi on the streets or for everyday driving. I guess you make a scramble for the 24 psi, but you had better be sure you have really good gas first.

Oh, I forgot about the headlift question... As far as I know, the increased cooling mods and upgraded headstuds (torqued to the CORRECT specs) has resulted in no known headlift... I could be wrong on this, but that is my understanding in my discussions with a few different shops around the country.

--B

 

Not sure the actual question as I am not currently running GTM's setup, but the actual block will hold 24psi. We have run 28psi so far.

 

Another thought that came to mind is that HKS head gaskets are great for the unsleeved because they help the walls but I wonder if there would even be a gain on a sleeved block as sleeving seems to eliminate what the HKS gaskets were designed to do.

 

well i'd love to see 24 psi, but the thing is that 24 psi on a 4.24 liter engine is a lot more power the block has to deal with than on a 3.5 liter engine

24 psi on a 3.5 liter engine = around 19.8 psi on a 4.24 engine in terms of power being made