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Worlds Fastest Comanche

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About Worlds Fastest Comanche

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    Comanche Aficionado

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    http://www.scottfabrication.com

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    Woodstock, IL

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  1. A while ago Aeroquip came out with a like of adapters to use a quick disconnect and a hose to easily change your oil. I installed one on my truck, and it sure made life easy. Looks like they are available everywhere including summit racing. you have to check what threads your current oil plug has, Maybe someone can chime in with the correct thread and size for each model year. The cheapest i have found them is here http://www.race-mart.com/Engine-Oil-Quick-Drain-Plugs_c_1133.html I put one on my dodge (cummins) it holds 12 quarts, it would never go into the drain pan. It ended up costing me about $60.00 for the male and female, but i plan to put them on all the vehicles so i will just need the one side @ about $32.00 each. The price is probably a little high for some, but it sure makes life easy. Oh a protective cap goes over the part on the pan to protect it between oil changes.
  2. gm had an Ecotec 2.0L output 1,500 hp. That was a drag race motor. They made some land speed ecotec motors that 0utput 750 HP. for a 4 cylinder 2.0l that is allot of hp. Some of these tuner motors are in the 800- 1,000 hp range. 800 hp is really not not that ambitious. the output of the jeep motor is really restricted by the head flow.
  3. And Just when you thought the thread was at its end, I thought i would show some of the performance potential of the 4200. The 5 cylinder would benefit from similar performance improvements. Here is a video of a 1950 chevy sedan with a stock motor doing a sub 14 second quarter mile. Here is a post i received from another board , he is running 8lbs of boost on a stock engine. : Hi All, I have a 69 Camaro that I have transplanted an 05 4.2/4L65E combo with a turbo making 470HP/450FTLB at 8 lb of boost. Am in the process of building an 06 engine to live with 15lb of boost. My goal is 600HP/600ftlb -- keeping my fngers crossed. Had to fab almost every piece on the engine, but had great fun doing it. Jeff Wieser Here are some pictures of a guy installing one into an Iroc Z. You can see how the turbo setup is easy to install on the passenger side. Here is a link to his build thread. http://www.motownmuscle.com/forums/showthread.php?140964-Vortec-4200-I-6-Turbo-IROC-Z Here is my point, If you build a stroker and get 260-270hp out of it, you done, you built the engine. You could turbo it, but performance is limited because of cylinder flow, and the plumbing is hard because of the non cross flow head. Look at the first picture above, doesn't look too hard to fabricate, and the exhoust pipe ends up in a good location for most jeeps, i guess the exception would be the CJ7 and earlier wranglers, but 1987 and up wranglers, MJs XJs Grands, it would all work well. Probably your next question is, well if you think it is such a great idea why don't you do it? I will, but currently working on the Turbo setup for the Bonneville truck, and i can only handle one project at a time.
  4. It is kind of like the Jeep 4.0 aftermarket, some stuff is available. You can get rods, pistons, etc. The big enhancement on these engines is turbocharging. If you go to youtube and search Vortec 4200 turbo , or just vortec 4200. looks like yo can get around 400hp out of a stock motor and 500 or so if you build it. This would be for a street car, not a full race. The nova up on youtube does a 10.4 quarter mile. I have been talking to this guy in Detroit who dropped one into a supra. Build thread here http://www.vortec4200.com/forum1/viewtopic.php?f=10&t=780 He is using a duramax turbo he got for $100 off ebay. The problem is that it is variable vane turbo and he is working on a good way to control the vanes. He says you can by a controller, but he is too cheap and thinks he can do it himself. The thread shows his turbo install, it is very low dollar. A company called Speed Steed did make a turbo manifold for a while but i have heard it is out of production. New turbos( from China) are available on Ebay for about $300 and you can get a US made turbo for $800-$1,200 The thing that makes all this possible is that you can reprogram the PCM. The Jeep engine controller is not reprogrammable.
  5. Finally found a HP chart for the 6 cylinder. The heave lines are the 2005 and earlier, the light lines are the 2006 and up. Looks like the earlier engine made more torque at lower RPM, but dropped off towards the top. Looks like the early motoe would actually be better in a daily driver.
  6. Here is a comaprison of a 6 Cylinder vs a small block chevy See this link for more size information http://www.vortec4200.com/forum1/viewtopic.php?f=7&t=782
  7. The 6 cylinder would totally blow away a 4.0 A stroker is a different story. The 6 cylinder is rated at 291hp, but a stroker would probably beat it a little in the peack torque department. On the other hand, because of the flat torque curve of the vortec, you would have more torque available at lower RPMs. As for the oilpan, well here is one solution. I guess all you need is a citoff wheel, some aluminum diamond plate and a tig welder Here is a link to a thread on the Colorodo 4x4 forum that talks about this conversion. http://colorado4x4.org/vbb/showthread.php?t=155422 I think the 6 cylinder would be a great way to go, but the costs associated with the oilpan and a Manual transmission flywheel seemed a little high to comapre with a stock engine replacement. There is a guy who makes an oilpan and he wants about $700.00 for it. Self racing sells a flywheel but it is $500. So those two items alone are $1,200.00 Here is a thread and it shows how to stretch and relocate the stock pickup tube and screen. http://www.vortec4200.com/forum1/viewtopic.php?f=10&t=780
  8. Here is a picture of the factory motor mount on the Atlas engine. The thing with the red cap is where the lower radiator hose attaches. This is a 6 cylinder, you can see the front sump pan that would not work in a jeep. the 5 cylinder has a rear sump.
  9. :hijack: See if we can get back on track, some people get 12 mpg with their 4.0 Comanches and some get 20 mpg. you can get a junkyard 4.0 for $250 or $1500 If you want a late model, low mileage engine, you probably will not get it for $250. I did some research of my own and a 2007 and up 5 cylinder Vortec 3700 does go in the $1,200- $1,500 range. Here is a link to a guy who paid $1,200 for a fully dressed 6 cylinder with 24 miles on it. http://www.vortec4200.com/forum1/viewtopic.php?f=10&t=786 That's 24 NOT 24,00. Using a Car-part.com search i did find 5 cylinder engines for $800-$900 some with less than 100,000 miles on them. So I am talking about a 2007 and up motor, a 4.0 would be a 2005 or earlier. The motor is lighter weight, more efficient, and has 50 more hp than a late model HO and about 60 more than the motors in the Comanche. It will also rev 1,000 rpm higher than a 4.0 allowing you to use lower gears and still be able to reach the same top speeds. Gas mileage: well throwing out the Magic Comanches that will consistently get 25mpg, I will pick a number that i think is a reasonable based on the Cherokees and Comanches i have personally owned. I will throw out the mileage from the Bonneville truck (4mpg) and say that my average mileage was about 16 mpg. If i drove 25,000 miles per year i would use 1,562.5 gallons of gas @ $3.50 per gallon that is $5,468.75 in fuel costs. If the 5 cylinder would give a 10% saving, that would be $546.00 I really think it would exceed 20%, a 20% saving is around $1,100 per year. 20% is only around 3 mpg. My wife's Trailbalzer with a 6 cylinder and is way heavier than a Comanche gets 18 mpg all day long around town. If the Colorado is rated at 19, there is your 3mpg ( and an increase of 50hp). Don't forget its an all aluminum engine that is much lighter, so less weight = more mpg ( ok somebody argue with that) Less weight also means less wear on front hubs suspension components etc. Is the 4.0 a great engine? Absolutely! The the Atlas motors are great too. If i could just pick any engine to put in a Comanche, it would be the 3.6L v6 Pentstar they are putting in the Grand Cherokee and the Wrangler. 286hp. The version in the charger is 305hp Problem is that you are talking big bucks. I have a grand Cherokee and with the Pentstar and i get 24 mpg driving 70mph. Great motor. But the idea was to do something on the cheap that somehow improves the vehicle. I think most people like to make changes to their truck, at minimum tires and wheels, probably a lift of some kind, maybe change the air cleaner to a better flowing one or put a header on it. change the bumper, etc. I think almost everybody wants more hp and better mpg, I say almost because i know somebody will come up with a reason that more hp and better mpg is a bad thing. Many of us buy a Comanche not because of what it is, but because we have vision of what we would like it to be. We see potential. to some extent that is how I am looking at the Atlas motors. I have built a 4.0 to a 5.0 and got 440 hp out of it naturally aspirated. It cost a ton of money and the bang for the buck was not there. The 5 cylinder installed is only the starting point. You have a fully programmable PCM ( EFI Live) A cross flow cylinder head that takes very well to a turbo. Probably another 75-100 hp easy. Then if we start talking E85, 450hp street truck. Seem like allot? A Cobalt from the factory with a 2L Ecotech produces 260 hp. 130hp per liter, so 3.7L x 130 hp = 481 hp and thats on pump gas! OK you can start your flaming now
  10. The 5 cylinder is shorter than the 4.0, engine and is all aluminum and probably less then 400 lbs fully dressed. The 6 cylinder is another story. The 4.5-4.7 stroker will probably have the same or more torque than the 6 cylinder. The aluminum block helps keep the temps down. However if you have a blown motor and are looking at a $1,500 junkyard replacement or a $2,000-$3,000 stroker, this might be an interesting alternative
  11. Not yet, but hopefully soon. i was reading about a guy who has a H3 5 cylinder into a FJ80, and his gas mileage went from 10mpg to 16 mpg and way better performance. The GM 5 cylinder is a member of the Atlas engine family that includes a 4 cylinder, 5 cylinder and 6 cylinder. The 5 cylinder makes about 240 ft/lbs of torque from 1,000-5,000 rpm and is rated at 242 hp. So it seem like 50 hp more that the 4.0, but because the engine will rev to 6,000 rpm all is not what it seems. The 2000 and up 4.0 is rated at 235 ft/lbs of torque, so the performance for a daily driver is similar, although the 5 cylinder has an almost flat torque curve. What is not similar is the gas mileage. The atlas engines are modern 4 valve per cylinder double overhead cam engines with a cross flow head. The jeep inline 6 design was first used in a 1966 Rambler as a 199cid engine. Engine technology changed allot since 1966, and jeep did go with multiport fuel injection. What they could not change was the cylinder head construction. only 2 valves per cylinder and intake an exhaust on the same side of the motor. The Atlas engines have variable timing on the exhaust cam which allows for better emissions, gas mileage and the flat torque curve. So how hard would it be to put one in a Comanche? Well if you has a manual trans, easy. The Colorado and canyon trucks with manual transmissions came with an Aisin transmission, so if you get a engine out of a M/T truck and get the bell housing it will bolt to your trans. Motor Mounts, well the block has a square plate bolted to each side with an arm sticking out, here is a picture of the side of the block of a 6 cylinder with the mount removed, but the 5 cylinder has the bosses in the same location So yea you have to make some motor mounts. Computer: You can get it reprogrammed for $100 to work as a standalone wiring: Check the FAQ section of Vortec4200.com http://vortec4200.com/forum1/viewforum.php?f=7&sid=17bd36d55d644952a2a4b6e0b92ab05f for detailed instructions on how to rewire the PCM to break out the wires you will need for power, ground ignition, fuel pump, etc. The rest will take a little work, radiator hoses, fuel connection, etc. But probably could still be done in a weekend. The engines are available in boneyards for $500-$700. the gas savings alone will pay for this thing in less than a year. Another note, I have only been talking about the 5 cylinder, the 4200 is the 6 cylinder and is rated at around 300 hp. Problem is that it has a front sump oilpan and no manual transmission flywheel is commercially available. If people have some interest i can talk more about the 6 cylinder, but the 5 is really a great value and the best bang for the buck. more information can be found on http://www.vortec%204200.com I would really love to see sombody do this swap, if I can help, PM me. Thanks
  12. OK the job thing has settled down, the plan is to go to Bonneville this year (2012), but with a Turbo and the engine putting out about 700hp. the goal is to break the 200mph mark. The engine will be 3.7L (226 cid) with a 3" stroke and a 4" bore. Redline will be in the 7,500-8,000 area. Starting work on the turbo header, i will post some pictures as we get further along.
  13. We were planning to go to speedweek, but I am in the process of changing jobs. I start my new job this week, so i had to cancel the trip. we will be going to Maxton in October and possibly the world finals at bonneville the first week of october.
  14. Well we did 4 runs, best was 12.9 @115 I think we can get to 12.5 with some work!
  15. Looks like we are on for tonight, i think racing starts at 7, We will probably get there about 6, Come out and support your local Comanche!
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