Ereschkigal Posted November 5, 2016 Share Posted November 5, 2016 Hey I just found this Speedhunter article claiming the Z Car Garage engine with LD28 block and OS Giken head has 470 HP on the crank. How is that even possible as N/A ? http://www.speedhunters.com/2016/11/race-car-stars-sema/ Quote Link to comment Share on other sites More sharing options...
Derek Posted November 5, 2016 Share Posted November 5, 2016 Move a ton of air. Quote Link to comment Share on other sites More sharing options...
ryant67 Posted November 5, 2016 Share Posted November 5, 2016 Wonder if it is actually using the diesel block, or if it's just using the diesel crank and the journo got confused. The diesel block is taller, and if sleeved can run a large bore. So it's not outside the realm of possibility for that engine to have a displacement up around 3.5L with a custom crank.Huge flow on a ported crossflow head with the right induction and exhaust, it's not unreasonable to get up around 450hp. Les Collins/Peter MacDonald down in Australia built a 3.4L stroker using a non-crossflow P90 head and it punched out 370-ish hp. Quote Link to comment Share on other sites More sharing options...
Ereschkigal Posted November 5, 2016 Author Share Posted November 5, 2016 That's a big jump 370 to 470 hp with 0.1 L more displacement Quote Link to comment Share on other sites More sharing options...
Derek Posted November 5, 2016 Share Posted November 5, 2016 The head flow and combustion chamber are a big contributor. No matter what you do to a L series combustion chamber it can't pull the the same CR numbers as a pent roof chamber. The number does sound high though. Quote Link to comment Share on other sites More sharing options...
madkaw Posted November 5, 2016 Share Posted November 5, 2016 Dave at Rebello is interested in my diesel block so someone is doing something with them. Quote Link to comment Share on other sites More sharing options...
Derek Posted November 6, 2016 Share Posted November 6, 2016 Tall deck and high RPMs seems to be the key to getting all the available NA power out of the OSG and most likely my KN20 as well. Quote Link to comment Share on other sites More sharing options...
Tony D Posted November 6, 2016 Share Posted November 6, 2016 220~250 cfm per intakevs240~320 cfm (or 400+ Potentially on Derek's Head)And the displacement to effectively process that airflow.A 3.4 will need about 9,000 rpms to use 320 cfm... Quote Link to comment Share on other sites More sharing options...
Ereschkigal Posted November 11, 2016 Author Share Posted November 11, 2016 New article but not much more info http://www.speedhunters.com/2016/11/os-giken-hakosuka/ Quote Link to comment Share on other sites More sharing options...
Tony D Posted November 11, 2016 Share Posted November 11, 2016 50 mm Jenvey's and only 10.8:1 CR? 470HP? BULLSHITE! No way no how, not in a million years. Someone tweaked the dyno constants for a good HP result. Totally BS. That head can run 12:1 on pump gas, running 10:8 I might believe a TURBO setup got them 470hp, but not NA, and not with only 50mm ITBS! Quote Link to comment Share on other sites More sharing options...
Derek Posted November 11, 2016 Share Posted November 11, 2016 Yea that number seems to be a bit of a stretch to me. Like Tony said 10.8:1 is like turbo CR for these pent roof chambered heads. I wonder if they could hit that mark if the motor can handle 10,000 RPMs? Quote Link to comment Share on other sites More sharing options...
texis30O Posted November 11, 2016 Share Posted November 11, 2016 @Derek...... just waiting on you..... I will have the "extra" 240z next week...... lol no pressure at all.... Quote Link to comment Share on other sites More sharing options...
evildky Posted November 14, 2016 Share Posted November 14, 2016 They had the same setup in the black S30 last year, they dyno sheet showed 376 hp, not sure if that was supposed to be crank or flywheel. I saw this car and just assumed it was the same didn't bother looking at the display for additional info. The guy last year claimed the inner finder restricted airflow on the S30, the hako engine bay is even smaller and the hako was of course RHD only, The S30 would have fit better if they had made the head flow the opposite direction wiht the carbs in the left hand side and exhaust on the right hand side. It is definitely a thing of beauty. Last year the OSG rep said the head was about $10k and the turnkey engine package was about $30k. sweet as they may be I am resigned to never owning one. Quote Link to comment Share on other sites More sharing options...
Derek Posted November 14, 2016 Share Posted November 14, 2016 I think you are a little low on the head price. The last I heard they were 26,000-28,000 USD. If they were only $10,000.00 I doubt there would be much interest in my head:) Quote Link to comment Share on other sites More sharing options...
grannyknot Posted November 14, 2016 Share Posted November 14, 2016 I think you are a little low on the head price. The last I heard they were 26,000-28,000 USD. If they were only $10,000.00 I doubt there would be much interest in my head:) Which begs the question, have you figured out yet what the magic number will be yet? Quote Link to comment Share on other sites More sharing options...
Derek Posted November 14, 2016 Share Posted November 14, 2016 $25,900.00 Not yet. Waiting for V2 to get back so I can finalize everything. I was hoping to nail down the machining prices when I did V2 but there were so many changes that it quickly became a prototype. And you don't want to pay those prices:) I've been telling everyone have $15,000.00 in the bank and you probably will be pretty safe. It really depends on the build you want to do. Quote Link to comment Share on other sites More sharing options...
Tony D Posted November 15, 2016 Share Posted November 15, 2016 Move quickly I only have enough for three left in the bank now, and that is quickly being frittered away on foreign investments... Quote Link to comment Share on other sites More sharing options...
evildky Posted November 15, 2016 Share Posted November 15, 2016 I think you are a little low on the head price. The last I heard they were 26,000-28,000 USD. If they were only $10,000.00 I doubt there would be much interest in my head:) That's what the guy at the OSG booth quoted last year. He was a little light on a technical knowledge, he might well have been off on price as well. It's not advertised anywhere that I have found. I've found a blog that quoted the head at $32k and another at $30k. Rumored production numbers in the single digits the price might go up every time someone actually tries to buy one. Quote Link to comment Share on other sites More sharing options...
budgy Posted November 16, 2016 Share Posted November 16, 2016 Why do people even make such ridiculous claims on power? I mean beautiful and powerful engine. I am guess they are over estimating the actual power figures by about 100 horsepower. Quote Link to comment Share on other sites More sharing options...
Derek Posted November 16, 2016 Share Posted November 16, 2016 Lets just agree they meant to ay 370 not 470. Because based on the listed specs that is probably closer. Quote Link to comment Share on other sites More sharing options...
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