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jorgoth
AMC Apprentice Joined: Aug/16/2014 Location: concord Status: Offline Points: 45 |
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Posted: Aug/16/2014 at 7:13pm |
hello all, im new to the forum. I have already started a build thread on another forum, feel free to view it.
http://c10forum.com/forum/showthread.php?t=18628 now that the fromalities are over, I have one question, have any of you guys with inline six's ever bought parts from Clifford performance? I talked with one of their techs and he seemed to know his stuff. |
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mmaher94087
AMC Addicted Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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Yes. Clifford knows their stuff. My inline 6 buying was in the 70's for my '64 Dodge Dart, 225 Slant Six.
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Mike
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Charlie Brown
AMC Addicted Joined: Jan/13/2013 Location: Oregon Status: Offline Points: 565 |
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I have had a Clifford intake on my six for over 20 years now, They do know their stuff. If you are after performance info you have come to the right place.
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Invest in rare metals, buy a AMC
74' Matador Coupe 06' MINI Cooper 14' Nissan Versa Sedan |
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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360 ft lb of torque at what rpm?
The AMC I-6 is a pretty stout little engine and there have been people who have built some pretty high HP motors out of them. The relationship between Torque and HP is mathematical. That is: (Torque X Rpm)/5252 = Horse Power so to realize your number there are a number of factors to take into consideration. Along with an application. A really high HP engine may not run very well for the street but that may not be important depending on the intended use of the vehicle. Or the rpm needed to develop that number as to the torque may make the vehicle it is in un-usable for some applications. But the engine itself responds very well to basic hotrod practices using multiple variations as to how that comes about. Edited by uncljohn - Aug/17/2014 at 3:56am |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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tyrodtom
AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6214 |
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Clifford Research was founded in the middle to late 60's by Jack Clifford. He started out by selling Hudson racing parts, then branched out into everything 6 cylinder, and later also 4 cylinder.
At one time they had everything, very good headers for all purposes, intakes, 2bbl, 4bbl, 3x2,2x4 or 2x2, cams and valvetrain components, and driveline components to build a high performance 6 or 4. Jack died several years ago but the company is still around. The last time I've had any dealings with them directly was in the late 80's, so I really can't make a accurate judgment on the current Clifford Research. |
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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jorgoth
AMC Apprentice Joined: Aug/16/2014 Location: concord Status: Offline Points: 45 |
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I never asked for hp ratings or the range of torque. I believe he may have mentioned 360 lb/ft of torque peaking at round 3,000rpm what is the max rpm of these engines when they are stock? |
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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The maximum rpm can be considered the point they reach just before they come un-glued. Picking a TSM at random from my files, 1974 a 258 developed 110HP at 3500 rpm and 195 ft lb of torque at 2000 rpm.
Once modified, that will change as the OEM cam shaft is decidedly on the weak side and the BBD Carburetor is rated at 193 cfm which goes rather flat around 3200 rpm. Changing the cam shaft on my modified 258 gave about 110 Rear Wheel HP about the same RPM which depending on how you calculate crank shaft HP from comes out about 145 HP with a flat HP curve through the 3000 rpm range. Changing the BBD carburetor to Fuel injection which removed the restriction of 193 cfm from the equation moved the HP peak further up the rpm range and is now estimated to be in the area of 180 hp at the crank. I have the automatic transmission shift point set for 4500 rpm for a WOT 2/3 shift which is when it shifts out of passing gear. Which reverts back to maximum rpm is just before it comes unglued and it sees 5000 rpm on occasion and has not come unglued yet. but keep in mind, others have built more hp and rpm into the engine and have had fairly successful drag racing careers with them. My motors are street motors with at least one objective that they also pass smog for my state. And they do. |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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tyrodtom
AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6214 |
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According to a article in the October 69 Rod and Custom, they quote from Dave Potter, the chief engineer in charge of the design of the 199-232.
Potter says the engine has a 3rd order torsional vibration peak at 5400-5500 rpm that won't allow the engine to stay in that rpm range for more than one minute without the danger of crankshaft breakage. It says you can rev thru that range to above it, but doesn't state a maximum rpm. I have buried the needle on a 7000 rpm tachometer ,with a 232, when a throttle return spring popped off on a downshift. No ill effects other than blowing the plastic impeller on the water pump. I drove the car daily for over 10 years after that happened. |
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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jorgoth
AMC Apprentice Joined: Aug/16/2014 Location: concord Status: Offline Points: 45 |
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Kinda what I was looking for? |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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I used a Clifford intake and Clifford long tube headers on my street/strip 258 powered Javelin. I don't think that there's a better manifold available (although the Clifford could be improved).
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1968 AMX 390 w/T5
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