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Post by pje on Sept 16, 2010 21:54:56 GMT -5
Looking really great Chris. Makes me want to do something like this in 1/18th. Stu And what did I suggest to you last week!  Paul Erlendson |
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Post by Chris on Sept 19, 2010 22:51:10 GMT -5
I have been working on the little stuff that add up to a finished project, first I finished scratchbuilding the intake and plenum, if you remember I didnt like the kit part and so  I made my own.., I finished the fuel ports and mounted the panard oil tank permanantly, which means the bottom half of the body is ready for decals   in the picture with the engine you can see I added the exhuast side of the turbo and the compressor side but not the turbo to intake pipe. I am experimenting with several materials for this, aluminum rod, stainless tubing, plastic.... I spent a bunch of time wet sanding the top of the body and priming  only to realise I have to cut it into two parts so I can remove it with the engine installed... I finished the lens on the gauges, made the water lines that go outside the body from stainles tubing, now I have to figure out what to connect them to the radiator and engine with, its complicated. I am making 3 master/slave cylinders so I can make up the pedals and footbox..I started the fuel injection block and the fuel injection pump today. I added the water by-pass to the engine as well  Lots of little high detail parts that when it comes together will make it shine..more in a couple of days..OH I forgot Anyone put the nose together on one of these? Was yours as far off as mine? This is going to take days to get right!!! Sorry about the photo quality, my friend changed all my settings and I cant seem to get them right again! |
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Post by Calvin on Sept 19, 2010 23:26:30 GMT -5
Awesome!
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Post by Deleted on Sept 20, 2010 14:29:35 GMT -5
Maybe the original question was answered, or not. The drive train layout of the 1968 Lotus was indeed reversed placing the 4x4, chain drive, tranfer case behind the driver. This would require any piston engine to be reversed also. In the photos of the intake /exhost layout appears to be in the same configuration as was typical of the 1968 Rinsoline eagle. Intake on the right exhaust on the left. The cam timing and engine rotation would need to be properly configured to make it all work properly.
At the time I had heard that the engine bay of the Lotus 56 had enough room for an Offy. Great to see this layout in action.
Thanks for the images,
John
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Post by smbrm on Sept 20, 2010 21:03:38 GMT -5
I believe that there were Offy variants to allow the intake or exhaust on either side of the head, so you could easily turn the engine around and put the exhaust on the opposite side.
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Post by clm1545 on Sept 20, 2010 22:37:56 GMT -5
Here we go again. The Offy does not not have a removeable head. To change the intake and exhaust from one side to the other all you do is change the cams and timing. If the cams both have the same lift and duration and are not offset, all you do is change the timing. The lack of a bolt on head is one of the reasons that they were so simple to turbo or supercharge.
Take Care
Craig
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Post by Chris on Sept 20, 2010 23:02:05 GMT -5
Correct there is no seperate head to switch around, the changes are Cams, Timing and modifications to the oil gallies... I did a lot of reading in preparation for this project... Chris
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Post by smbrm on Sept 21, 2010 1:33:17 GMT -5
I agree, I misspoke. I was referring to the head/cylinder block unit that can be separated from the crankcase. There are references suggesting that the cylinder block was reversed to allow the intake and exhaust sides to be swapped. I suspect that the exhaust and intake cams just needed to be swapped as well, as the cams shafts rotated in the same direction, being driven off the same gear. Commenting before thinking it through completely is not always appropriate! I believe that there was also a reverse rotation engine built by Smokey which would have required more extensive modification.
I am curious if there are references to support the use of a distributor instead of the standard offy magneto?
I am aware that the Chrysler powered 4wd was tried with both a 4 speed manual and a 3 speed automatic transmission. I have never seen a reference to which 4 speed was used, which would probably be similar to what would have been used with the offy.
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Post by Chris on Sept 21, 2010 2:27:26 GMT -5
It was my decision to use a Distributor instead of a Magneto, there was no documentation either way, First, I hate Magnetos on race cars they look so old school, second, the use of a distributor allows me to use electronics that were just begining to see their day in 69, kind of a transitional year.. I could have scratchbuilt a real nice mageto but I felt the super clean look of the turned aluminum distributor looked much better for this application...Chris
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Post by smbrm on Sept 21, 2010 2:32:04 GMT -5
Fair enough! Excellent work btw!! It was my decision to use a Distributor instead of a Magneto, there was no documentation either way, First, I hate Magnetos on race cars they look so old school, second, the use of a distributor allows me to use electronics that were just begining to see their day in 69, kind of a transitional year.. I could have scratchbuilt a real nice mageto but I felt the super clean look of the turned aluminum distributor looked much better for this application...Chris |
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Post by clm1545 on Sept 21, 2010 19:16:03 GMT -5
If you look at a Offy engine you will notice that the intake and exhaust ports are the same, as are the valve sizes. You can bolt the manifolds on either side, nothing needs to be reversed. Back in the early days many cars had the exhaust on the right side of the car. It was more or less what the mechanic liked. Regarding reverse rotation, it is also a matter of cams and timing. Any engine is just an air pump and it makes no difference which way it rotates. Many twin engine aircraft and boats use conteroating engines to cancel torque. If my memory serves (not as reliable as I age) I think that Smokey, one of the great thinkers, tried a reverse rotating engine to load the left side of the car coming off the turns.
Chris, I am blown away at the level of detail in this build. I don't know if a distributor or a mag is correct, but if you use a distributor don't you have to have an alternator and battery?
Take Care
Craig
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Post by smbrm on Sept 21, 2010 23:34:42 GMT -5
From Design and Development of the Indy Car by Roger Huntington Page 103
"... the original Offy engine design lent itself very nicely to these extreme installation positions. When Leo Goossen laid out the design in 1931 he made the block so it could be turned on the crankcase after redrilling the camshaft oil passages. This meant the exhaust and intake could be switched to opposite sides by doing some minor machine work and reassembling the engine with the block turned in the opposite direction...."
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Post by clm1545 on Sept 23, 2010 21:50:17 GMT -5
Although it sometimes feels that way, I was not around in 1931 when the first Offy design was laid out. In the mid 60's I did spend a few years working on a friends Indy car. First a Watson roadster and then a Halibrand Shrike. We used the same Meyer Drake engine in both cars. When we tested the Shrike, to save time and money, we used the header from the roadster and cut most of the pipe off. We mounted the exhaust on both sides of the car to see if it made any difference in handling. To do this, we swapped the cams and changed the timing. We ended up running the exhaust out the right side because the owner/driver thought he might get less turbulent air on the left side for the injectors. At the time I was in my teens, and I was amazed that it was that simple.
Take Care
Craig
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Post by Chris on Sept 23, 2010 23:07:07 GMT -5
Craig, hang in there I haven't gotten to the battery yet, or the ignition system. I am slowly getting some body work done and I am awaiting some info from Classic Team Lotus UK on the chassis, engine and other details. Also from Mike and Georgia Pollard who think they may have some pictures of the car with the body off.. most race cars using a distributor can easily go 500 miles on just a battery and no alternator so I wont be putting one on. I am also working on the Master, and Clutch cylinders and the linkage attaching them to the pedal assembly, I had initially put the pedal assembly together to go in as a hanging unit but closer inspection of the reference picture and some complications have caused me to re-do it to a floor mount assembly..more later.......Chris
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Post by Deleted on Sept 27, 2010 9:43:43 GMT -5
Chris, you should do this one next! 69 Sam Posey Plymouth. Stu [img src="http://i640.photobucket.com/albums/uu127/sbenford/076.jpg" ![]() img] |
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Post by Chris on Sept 27, 2010 12:40:04 GMT -5
That is the Plymouth version, I just found a head on shot of this car the other day.. It is a Lotus 56B and not a Gebhardt.. The wings and stuff are pretty wild, but if you look at the condition of the car it is really Thrashed!!! It is tempting but so many projects and so little time..Chris
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Post by Chris on Sept 28, 2010 20:33:31 GMT -5
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Post by Calvin on Sept 28, 2010 23:15:23 GMT -5
Wow, cant wait 'tel its done!
You defiantly have that realistic touch.
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Post by Patrick on Oct 1, 2010 23:02:22 GMT -5
Chris,
Bloody damn good, mate!
Patrick
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Post by Chris on Oct 2, 2010 18:12:20 GMT -5
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Post by Calvin on Oct 3, 2010 1:41:24 GMT -5
Nicccee.....You gota love flo red
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Post by illeagle10 on Oct 3, 2010 11:48:40 GMT -5
I actually expect to see this thing run when you're done!!!! At least one qualifying lap!
Jim
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Post by 2lapsdown on Oct 3, 2010 11:59:55 GMT -5
Jim, I'm with you. Let him qualify and then kick him off the forum for making the rest of us look like wankers!! Chris, your work is unbelievable, thanks for sharing.
John
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Post by Chris on Oct 3, 2010 12:28:15 GMT -5
Thanks Guys, but my wife wont let me have Fuel in the house!!! If you have the 2010 Contest Cars by Scale Auto the coverage of my show So Cal NNL has a 1/3rd page picture of the project before this The Ford GT40 DOHC thats if you can handle more of my work....
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Post by kurzheck on Oct 5, 2010 7:46:35 GMT -5
Chris,
Your GT40 is gorgeous!! Expect more magazine coverage with this Lotus.
Trev
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Post by Chris on Oct 8, 2010 12:58:40 GMT -5
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Post by Deleted on Oct 8, 2010 14:50:15 GMT -5
Looking  Great!!!! |
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Post by Calvin on Oct 8, 2010 16:55:30 GMT -5
You missed a few...  Looks really good.....its hard to avoid the clear coat and polish. |
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Post by Chris on Oct 8, 2010 17:20:57 GMT -5
The total amount of time on the paint once the body work was done was about 2 weeks, prime and sand, repeat, repeat, color coats, wet sand , repeat, repeat repeat and then let cure about 4 days, and dont touch it!!! A little drawn out even for Tamiya Lacquer but my results have been great.. I owe this learning curve again to my wife telling me go slow and do it repeatedly until its right otherwise I would just slap it on and throw clear on to hopefully hide screw ups!!! |
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Post by indy on Oct 8, 2010 18:43:50 GMT -5
Smart wife :-D that is just a great looking build!
Jordan
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as you can see there have been some changes, mostly to the engine cover, now 2 pieces and cut out to clear the turbo setup, the nose has been re-done and the 2 splitters added as well as reshaping the ears around the suspension now its just pime and sand and prime and sand and on and on ...until its right and everything fits just right, I have been making little parts and such that will show up when I put them on...
its starting to get there and looking like it....Chris 
Yesterday was a great day for the base Red coats on the car, I applied a couple of coats and let it sit until this morning and then wet sanded it out. This afternoon I decided to lay down the first of 3 coats of Florescent Red and man I gotta tell you, this paint is great, I would leave it and just rub it out but since I put 3 coats of the fluorescent red on the tub i am obligated to do the rest of the body otherwise the paint will not match in intensity...But I am on my way to a great paint job... 
Great!!!!
