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Senior Member
Join Date: Jan 2001
Posts: 539
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Project Twin Turbo - Making Progress
Gentlemen, it's starting to really take shape. All of the "major" fabrication is done.
  
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08-13-2003, 07:27 PM
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Registered
Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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Nice work Mark. Is that a Spearco core? I see you made your own heater block off plates
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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08-13-2003, 07:40 PM
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
Posts: 5,620
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Do you need an apprentice to polish your cam cover bolts? OK, I'll even scrub your floor with a toothbrush. Teach me, o' wise one.
 How are you planning to drain the oil from the turbos? Any guesses on the HP output? If the dyno reads less than 110 HP, I would consider your project a massive failure.  jurgen |
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08-13-2003, 07:51 PM
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Senior Member
Join Date: Jan 2001
Posts: 539
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Dean, yes it's a Spearco. Spendy little bits they are. They are very proud of their stuff. Nice catch on the block off plates. I'll update my website with lots of pics sometime.
Jurgen, you are funny. I'm still debating on several potential solutions for the oil scavenging. The fail safe way is a single stage dry sump pump. The drawbacks to that are high cost and requires a 2 belt system because it has to turn at a reduces ratio compared to crank. I'm also considering a power steering pump but haven't concluded if its viable. The pros are lower cost and doesn't require reduced ratio so I could retain a single belt setup. The cons is its somewhat of an unlnown and I'm a little shy of trying new things for something so important. I've been doing R&D for 3 years now and want to stay "this side" of the line. If it only makes 110 hp I will consider it a failure too. |
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08-13-2003, 08:33 PM
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Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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Very nice.
As far as turbo scavenging goes, why not just run a 930 style turbo scavenge pump off of one of the cams? |
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08-13-2003, 08:38 PM
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Senior Member
Join Date: Jan 2001
Posts: 539
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because it's questionable if a regular 930 pump can support twin turbos. I know I can go with an aftermarket pump (for back of cam) but they cost as much as a professional dry sump pump and they are really just a modified VW oil pump.
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08-13-2003, 09:12 PM
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Registered
Join Date: Jun 2003
Location: South Carolina
Posts: 83
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beautiful work!!!
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Tad A. 82 911SC Targa, Euro Sadly down to 1 Porsche, for now... |
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08-14-2003, 04:51 AM
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Registered
Join Date: Dec 2001
Location: MA USA
Posts: 2,938
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Hey Mark
Do you have a good source for the Spearco's? The are the best core around but I can only buy them from a middle man and he wants a huge cut. If I were you I would adapt a VW pump for the scavanging unit. It looks like you have the skill to do that Again nice work
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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08-14-2003, 05:06 AM
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Registered
Join Date: Jun 2003
Location: Paris, France.
Posts: 34
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Nice intercooler.
Good job. I'm working on a similar project here. Which turbos do you use ? K26 ? Do you keep them with stock trims and A/R ? Are the two ones identical ? What kind of throttle do you use, it looks to be the 3L2 plenum ? How will you manage the engine ? Sorry for the questions, I'm so excited to see such another work :P Congratulations Best regards Luc.
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Porsche 961 Le Mans'86 |
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08-14-2003, 05:44 AM
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Join Date: Apr 2003
Location: Las Cruces, NM
Posts: 2,459
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Why not use a 935 oil pump, wouldn't that supply it fine?
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix 
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08-14-2003, 06:02 AM
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Mark,
Beautiful work. What's the base platform? 3.2?
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Warren & Ron, may you rest in Peace. |
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08-14-2003, 06:30 AM
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Join Date: Oct 2002
Location: Monument, Colorado
Posts: 266
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Impressive work! Are you using the same base engine as The Beast, or is this a new engine? What happened to the beautiful supercharged engine?
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Jeff 1981 911SC Coupe - SSI's + Dansk, MSD, AC delete, Heater Backdate, Euro ride height, polygraphite bushings, Rennshift 1998 F-150 4x4 - Snow Time 1998 Yamaha WR400 - Mountain Ride |
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08-14-2003, 07:22 AM
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Senior Member
Join Date: Jan 2001
Posts: 539
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Blown, email me directly with the Spearco stock number and I'll see what I can do.
961, they are K16's that will be modified by Kevin at Alimo. I'm using a Haltech E6K for engine management. All, sounds like you haven't been to my webiste. It has full details on the motor being built. It's not updated for the turbo stuff yet, it still has the SC stuff on it but you will see. |
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08-14-2003, 07:27 AM
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Join Date: Nov 2002
Location: Los Angeles
Posts: 2,571
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Looks beautfiul ... hope it goes as fast as it looks
On the other side of things, I am really interested to find out how your headers work out. I remember you mentioning that they don't need to be equal length runners, but I'm not so sure. I'm not saying your wrong ... I hope that I am. Are you going to dyno the motor once complete? Or are you gonna just stuff it in the car and go for broke? I would really like a link to your site to get specifics on the engine's guts, if you would be so kind as to provide one. It's a great looking motor ... but those turbos are awfully close to the valve covers. Is heat going to be an issue? Also, what car is this monster going to motivate? Would be a blast in a 914-6 
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08-14-2003, 07:40 AM
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Join Date: Apr 2003
Location: Las Cruces, NM
Posts: 2,459
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I think in turbocharged engines, short exhaust headers to the turbo are more priority for lag reasons than equal length. I believe equal length is a big deal for really high rpm, high horsepower. Basically the shorter the exhaust manifold, the less volume to fill with exhaust pressure to spool the turbo up.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix
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08-14-2003, 08:02 AM
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The link to his site is in his Signature line....titled "The Beast"
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Warren & Ron, may you rest in Peace. |
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08-14-2003, 09:20 AM
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Former Options Trader !!!
Join Date: Feb 2003
Location: Bucks County PA
Posts: 6,756
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Just breathtaking
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Current:88 Guards Red Coupe, 89 Coupe Track Rat, 76 Caddy Eldo Convert. 2015 Aprilia Tuono Wrecked 1987 Targa Guards Red, 2003 Ducati ST4S Sold 1987 Granite Green Targa, 993's, 93 RSA, other 964 coupes, 89 911 Turbo Ruf mods, 90 e30 M3, 07 BMW R1200S STOLEN 94 Speedster |
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08-14-2003, 09:28 AM
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Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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Turbo headers just need to be short and free-flowing. Usual N/A wisdom is not a big player here.
Turbo lives on flow and flow is proportional to volume, volume is proportional to temperature (PV = nRT). Long headers just cool down exhaust gases, so there is not much left to turn the wheel. That's what they mean when they say that turbo uses wasted thermal energy and the reason why people use thermal-wrap around their turbo-headers. You want turbo as close to head as possible in order to use as much wasted heat (=flow) from the exhaust gases as possible. Doing equal-length headers thing will marginally improve scavenging in turbo car (beacuse there is lot's of backpressure = impeller) and those long pipes will just cool down gases and weight a lot, so it's not a good option on turbocharged cars unless they can be made really short.
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Thank you for your time, |
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08-14-2003, 09:42 AM
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You are one of the ulitmate conversionist on this board. First the Super Charger, now this. Looks awesome.
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72 911 Although it is done at the moment, it will never be finished. |
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08-14-2003, 10:13 AM
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Senior Member
Join Date: Jan 2001
Posts: 539
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Thanks everyone. Yes, my website is on my signature but just in case its: www.mark.hargett.com
I wasn't entirely please with the air filter boxes so I changed them today. Now it looks like this:  
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08-14-2003, 01:10 PM
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1985 Porsche 911 3.2 (Still in the stable)
1993 BMW 740 IL (Sold)
1985 Mercedes 380 SL (Sold)
1992 Harley Davidson Fatboy (Sold)
1971 Mercedes 280 SL (Currently being restored)
Tobluforu
