Steve,
Did you figure out how to do the sparkplug boots at your wednesday meeting?
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Steve,
Did you figure out how to do the sparkplug boots at your wednesday meeting?
Here is the final mold. I'm going to cut it with a .032 ball nose mill. I also Got a shipping notice that the putty is on the way. I have never tried this before so we shall see.
http://i770.photobucket.com/albums/x...untitled-6.jpg
Got the first side of the mold made. I'm hoping to do the other half monday.
http://i770.photobucket.com/albums/x.../DSCN2085s.jpg
looks good. can't wait to see if your plan works out. all you can say at this point is "it looks good on paper"
Steve,
I just got my ignitions and was playing with them, they do work quite well. however I got to thinking about this a little and they are rated at 12000 sparks a minute. by my math this would make the rpm limit on the V8 at 3000 rpm. 12000 sparks per minute divided by 8 cylinders is 1500. multiply by 2 since the distributor spins at half the crank speed equaling 3000 rpm. is this correct or am I missing something?
Craig, it would not be even the 3000rpm limit would it.
For every rotation of the rotor it fires 8 times 12,000/8 = 1500rpm, something ain't right here :confused:
Ken,
yes you are correct that 1500 rpm of the DISTRIBUTOR would be the 12000 sparks per minute. however, the crank makes two revolutions to every one of the distributor. so you have to multiply by 2 which equals 3000 crank rpm.
ok, I see what you were doing after a re-re-read
If I use 2 of the ignition modules I could get 6000 rpm. I would have to alternate the polarity of the magnets on the disk. every other one would be south pole facing up the others opposite would be north pole up. then I would need 2 hall effect sensors. spaced at 90 degrees apart from each other. one above the disk one other one below. the problem with that is getting 2 different spark leads into a single distributor.
The rating on the ignition is very conservitive. I was told to try it and see what happens. If you cant get the performance you want (above 6000) he can make a duel coil ignition that is rated higher. I don't expect to rev higher than 6000 so it's not an issue for me. Maybe you should call him yourself and see what he and yourself can come up with based on your needs. The duel coil will get you into the 8000 and higher range. If you are going to aim for those kinds of rpm's you might start looking into a hardened and ground crankshaft in 4340. I'm not sure you want to go there with a soft crankshaft.
Call Roy or email him. He is a great guy. He will be better equipt to advise you. He has been in the ignition game for a while and has installed them in many different applications.
OK thats a starting point I guess. as for the crank its being made from 4140 pre hard just like the cam is.
just got done doing a little "test" I hunted up a small electric motor. came from a gws A-10 model plane. had trouble getting the rpm down to a reasonable range. at 6v it was running at 13000 rpm. found that 1.5 volt put it right at 4000 rpm. exactly what the distributor would be turning if the engine were to hit 8000 rpm. the I hooked it to the distributor and let it fly. the ignition fired the plug reliably at this rpm. it fires so fast its more of a hum than anything else.
if it will fire one at this rpm I see no reason why it wouldnt fire all eight. the only real difference is that the spark is being directed to a different plug through the distributor. I am in the process of uploading a video of my crude little experiment.
i do think were going to have to devise a way to advance the timing though. i have a few ideas. bu need to find the time to work on it.
heres the vid. not sure if this will work right. obviously I do no know how to porperly embed a youtube vid so heres the link
[ame="http://www.youtube.com/watch?v=hUcxVSZYsMg"]MVI 0404 - YouTube[/ame]
ok that was too easy
the hit and miss of the firing is me moving the distributor around and not staying lined up with the hall effect sensor.
They are under rated. If you plan to turn 8000 or higher you should get Roy to make you one of the duel coil units. He suggested the single coil for 6000 or lower. At 8000 you might get some overheating during extended runs.
Sure is awesome when your stuff works well isn't it!!
My endmills still have not shown up so I made a few more plugs. Now all the sparkplug holes are plugged. All the plugs are gaped. I'm going to try .025 gap and see if that works. I also made some wire holders to tame the ignition wires. I also filled the crankcase with oil.
http://i770.photobucket.com/albums/x.../DSCN2108s.jpg
http://i770.photobucket.com/albums/x.../DSCN2106s.jpg
Steve,
Looks like you're getting close. did you get the plug boots molded yet? or are you still waiting on something for that. the wire looms look good and did wonders for keeping the wires in order.
I have a call in to Ron. his wife I think, sent me a reply saying hes out of town until Wednesday night. i will inquire about the dual coil version. but its nice to know this one will do if needed.
I'm waiting on some 1/32 endmills to make the other side of the mold. I have them coming. I also ordered the rubber material.
This is the bad part of being almost done. I can't just go work on something else. All i need are the boots.
The exhaust pipes are done but I am going to have a pro silver solder them together. He has been doing stuff like this since the fifty's and when he saw what they were for the price went down to a frosty 6 pack.
I see you have a gas can in the ready!
Build looks really good.
Yeah I hear ya on the waiting game. so far the only thing I have had to wait on was the cam gear. but I had plenty of other things to do while waiting on it to arrive. I am doing the waiting thing now I guess. but its not for parts. its waiting for time to be able to work on the engine again. which at this point Im not sure when thats going to be. My schedule was pretty full til the end of this month and then I had a little lull for about a week after that. but not now. Im booked through the end of next month. with more waiting to be squeezed in if I can fit it in somewhere.
I agree 100% on this sentiment. I have modeled about 50% of the parts since I received the plans yesterday with no problems. A little sleuthing needed between pages to find a dimension or two, but a great set of plans. Steve could double or triple the price and they would be worth every penny.
Plan to start building in the next few weeks as time allows (and when its not 150F in my Texas garage).
Great work Steve!
Steve,
It just occurred to me. does the local auto parts store carry a filter element for the air cleaner? I doubt they do. so what do you have in mind for the filter element? a piece of screen backing up some of the roll type filter media? or something else?
K&N have some down a small as .25 ID.
Steve,
Behind the screen you could add some foam coated in oil like the RC engines use. that would catch any really fine stuff.
Also do your plans require casting?
ooo!
Yesterday I made the second half of the boot mold. After being sent home from work because of a small fire and power failure in the refinery, I made the core pins and made a test run.
http://i770.photobucket.com/albums/x.../DSCN2133s.jpg
I could have mixed the material better. The color is not good. I think I pressed a little harder than I should have also. The result was great. I have made 5 boots now and they look better. I tried to color one with black pigment but after 1/2 hour in the mold it was still soft. Grey will look just fine.
http://i770.photobucket.com/albums/x.../DSCN2128s.jpg
They look a little big but so do the plugs so it is something i will learn to accept. I don't think I want to go any smaller.
http://i770.photobucket.com/albums/x.../DSCN2130s.jpg
Nice job! Those look perfect.