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#21
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That's cool!! I think the new technology is awesome. I just did not want anybody getting all wigged out LOL.
Don Johnston DCI MOTORSPORTS INC. 330-850-5050 shop 330-628-3354 cell Designer of the DCI Tiger Heads and the NEW DCI Ram Air 5 Heads !!!!! |
#22
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A little off topic (well engine wise anyway, I do realize it says Pontiac) but just for ****s and giggles, my sons junior dragster makes 46HP from 15.2559 CID LOL (250cc) so smaller must be easier LOL
This comes out at 3.01 using factory ratings for the engine TQ peak is at 10,500 and peak power at 15,500, factory redline at 18,000 Its a 4 cyl, 4 stroke with 4x 25mm Kehien carbs on 96 octane pump gas. Not related I know, but sometimes I think you need to look at extremes to make sure you are not clouding yourself with what you think is a limiting factor, I know I have been guilty of this in the past myself. Obviously Pro Stock is the place to look in this thread for more conventional layouts, ie pushrod if you could call their stuff conventional LOL. I know the thread stated a cylinder head available now, and I realise the logistics and possible suicide mission it would take financially, but would an OHV deal make this easier in the future ?? Back to topic, seriously interested in short block discussions relating to deck height, rotating assy parameters and bay to bay windage discussions if anyone is willing to spill the beans (as long as its not proprietary information that pertains directly to their business as mentioned)
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Working on going faster (and now staying dry at the same time !!) |
#23
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I believe George Bryce as of the end '13 was running 2.7" with a .600" lobe with 2.0:1 rockers intake and 2.0" with a .600" lobe with 1.85:1 rockers exhaust. But remember that they are 2 cylinders and if it was a v8 it would be around 640 ci, yet they turn over 10,000 RPM. Note they are running a 5.1xx" bore. Since last fall George PMed me the HP and torque, lets just say it is over 2.3 HP per and under 2.4 HP per. Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#24
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I believe 2.5 is attainable with the right combo...that would NOT include a 10.24 deck height. .
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#25
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Curious What engine is that? We're developing a 450cc (22.5 CID) 2-Stroke; Carb'd been making over 55HP at 6000, probably more at 6700. Goes to 8000 if we let it. Think it was93 Octane but not so sure. fuel-injection is suppose to help the SMALL engines make more power, so we're looking forward to that. |
#26
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Trust me Stan, I know every last thing about George's cyl heads.
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John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
#27
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As far as heads... I cant disagree that there are a few we already have that are candidates to top this motor. |
#28
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How much effect does a merge collector as opposed to a try-y header have on the power curve? Anyone have any experience with that?
Don Johnston DCI MOTORSPORTS INC. 330-850-5050 shop 330-628-3354 cell Designer of the DCI Tiger Heads and the NEW DCI Ram Air 5 Heads !!!!! |
#29
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Not bad for @ 30 ci motors, 2 of which came with warranty. Both liquids docile enough for novice users. Fan was at its thermal limitations... just couldnt cool spark plug(10 series NGK) long enough to stay out of trouble pushing more power thru it. Find a way to seal up a Pontiac and mods needed to make it a 2 stroke reed valve motor and 3 hp per ci NA should be doable. |
#30
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So back to the original target here of 1150 HP.
The biggest bore size is 4.400", the stroke is 4.114". What is the peak RPM? Calvin Hill Hill Performance 708-250-7420 |
#31
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Why is the biggest bore 4.400? Who says
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John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
#32
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Just like with anything else its chit you got to test and test multiple variations to find what works the best. I personally have only ever had Try Y on my car that I made, and the reason for that is because they fit in the car really good. Now I will no longer be running a Try Y , probably ever.
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John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
#33
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Bruce, thanks for sharing your perf data. Enough about 2-strokes huh.
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#34
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For gasket consideration I'd go a tid smaller on bore(4.375) and use 4.15 stroke for a 499 displacement . I think a 3.75 stroke short deck at 451 would make 2.3 or better easier... (2.549 per ci at 451 to 1150 hp would be a real stretch unless you hit powerball) |
#35
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#36
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__________________
John Marcella Marcella Manifolds Inc. john@marcellamanifolds.net ph. 248-259-6696 |
#37
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With the bore and stroke I listed, an RPM range of 8500 to 8700 would be the target.
The VE should be enough at the piston speed to make the projected power with a cylinder head that flows 475 CFM to 495 CFM. John, where did your build make peak power? Calvin Hill Hill Performance 708-250-7420 |
#38
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Where would u put the range on s 451 with 450cfm.heads
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#39
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You are likely correct, I guesstimated VE and bsfc a tid on the conservative side... Stroke choice makes a difference... 4.375 bore 451 or 499 combo is going to be different rpm ranges with same heads though the smaller motor does have better VE potential.
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#40
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Quote:
Calvin Hill Hill Performance 708-250-7420 |
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