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Brady
Joined: 26 May 2008
Posts: 182
Location: Poulsbo, WA
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 Posted: Wed Feb 11, 2009 4:44 pm Post subject: News from Magnificent Machine |
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For those who might be interested:
We have made some updates to our website and added a few products to the "coming soon" section.
Check them out at:
www.magnificentmachine.com
MagVair Forged Pistons:
We now have pistons in all sizes in stock and ready to ship.
This is the second run of pistons; we have tightened up the pin to piston tolerances a little.
Due to an increase in manufacturing costs we are forced to increase the prices slightly.
However we realize that some may have been waiting for these to return to stock before placing their order.
As such, we will hold off the price increase for a week or so.
MagVair Forged 4340 Rods:
Our Rods have been on back order for some time now due to a container that was "set aside for inspection".
The container has been released and I expect the rods here any day now.
Those of you who have patiently been awaiting these will not be disappointed.
MagVair Forged 4340 Crankshafts:
The crankshaft project continues to move forward.
We now have a 3" stroke crankshaft in a case with our rods, pistons and aluminum cylinders.
This engine is very close to completion and I expect it to run within the next couple of weeks or so.
We will then proceed with testing.
We recently put a 3.25" crankshaft into a case with a cam and two rods.
When we rotated the crankshaft we were looking for interference between the rods & the cam lobes.
It was a quick and dirty test to see if it was going to be a big problem or a small problem.
We did not see any interference with those two rods.
We have not mocked up all of the cylinders yet so we may find some interference with the other rods.
At this time it looks like there should be no problems.
We will mock up the entire rotating assembly soon as time permits.
Paying customers come first; R&D doesn't pay the bills. 
Our next Engine project looks like it will have the 3.125" crankshaft and 92MM cylinders.
This will net a 3165cc engine.
Thank you,
Brady McCormick
Magnificent Machine LLC
17970 Thompson PL NE
Poulsbo, WA 98370
1-866-606-4152
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Brady McCormick
Poulsbo, WA
www.magnificentmachine.com |
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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| Posted: Wed Feb 11, 2009 5:30 pm Post subject: Re: News from Magnificent Machine |
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Brady,
I'm excited to hear about the products you're developing for the corvair community. I'll especially be watching your progress with the testing of the aluminum jugs. I'd love to knock some pounds off my vair engine.
I guess one place where I differ with you and some other corvair builders is the move toward more displacement, stroke and resulting power output. One thing that drew me to the corvair as an engine solution is the fact that we normally down rate them from the 120 HP output in most corvair automobiles to the 100 HP seen in most aero conversions. I gain a great comfort level from the knowledge that I'm not stressing the engine in rev's or HP. I realize you are also trying to make improvements in the strength of crank and connecting rods to offset the added power/stress. I'm not sure these are enough. Suppose your bored and stroked engine makes 150 HP. Maybe this is over simple, but it seams like you'd want the strength gains to be 50% better than the original parts. Lot's of other things are stressed, like the head studs that I assume you'll being using stock. These are just hypotheticals, the point being I'd like to hear your thoughts on these issues. Others are flying the 3100 "Big boys" so you're not the only one to think the engine can take it.
Dan 601xl Dempsey
| Brady wrote: | For those who might be interested:
We have made some updates to our website and added a few products to the "coming soon" section.
Check them out at:
www.magnificentmachine.com
MagVair Forged Pistons:
We now have pistons in all sizes in stock and ready to ship.
This is the second run of pistons; we have tightened up the pin to piston tolerances a little.
Due to an increase in manufacturing costs we are forced to increase the prices slightly.
However we realize that some may have been waiting for these to return to stock before placing their order.
As such, we will hold off the price increase for a week or so.
MagVair Forged 4340 Rods:
Our Rods have been on back order for some time now due to a container that was "set aside for inspection".
The container has been released and I expect the rods here any day now.
Those of you who have patiently been awaiting these will not be disappointed.
MagVair Forged 4340 Crankshafts:
The crankshaft project continues to move forward.
We now have a 3" stroke crankshaft in a case with our rods, pistons and aluminum cylinders.
This engine is very close to completion and I expect it to run within the next couple of weeks or so.
We will then proceed with testing.
We recently put a 3.25" crankshaft into a case with a cam and two rods.
When we rotated the crankshaft we were looking for interference between the rods & the cam lobes.
It was a quick and dirty test to see if it was going to be a big problem or a small problem.
We did not see any interference with those two rods.
We have not mocked up all of the cylinders yet so we may find some interference with the other rods.
At this time it looks like there should be no problems.
We will mock up the entire rotating assembly soon as time permits.
Paying customers come first; R&D doesn't pay the bills. :-)
Our next Engine project looks like it will have the 3.125" crankshaft and 92MM cylinders.
This will net a 3165cc engine.
Thank you,
Brady McCormick
Magnificent Machine LLC
17970 Thompson PL NE
Poulsbo, WA 98370
1-866-606-4152 |
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Scratch building XL with Corvair Engine |
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Brady
Joined: 26 May 2008
Posts: 182
Location: Poulsbo, WA
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| Posted: Wed Feb 11, 2009 10:15 pm Post subject: Re: News from Magnificent Machine |
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Dan,
If the aluminum Cylinders prove to be a viable option,(and I think they will) they are 3 pounds per cylinder lighter than the stock ones. That's 18 pounds off you engine. And it's not necessary to stroke or overbore the engine to accomplish this.
The Stock Corvair engines that most people are converting to aircraft engines were only rated at 110 HP in the automotive application. I would be very surprised to see a stock Corvair actually produce the "advertised" HP.
That being said the Turbo Sypder was advertised to put out 180 HP. This engine used the same Con Rods, the same cases, the same head studs, the same valve train, the same cam gear, etc. the only difference between that engine and the 110's is the crankshaft came Nitrided from the factory, and they used a lower compression heads to accommodate the boost, and the combustion chambers were shaped differently.
Essentially it was the same engine.
The Aircraft community is by no means on the cutting edge of Corvair development. The race car guys have been pushing this engine to its ragged edge for some years now. I know of one Corvair (Sand-Dragster) that is putting out some where near 750 HP on Nitro Methane & 40 - 45 pounds of boost.
When the Dragsters owner told me this I just laughed at him.
I thought he was crazy and was trying to BS me.
Boy was I surprised!
Obviously this guy has broken some engines & granted it's a Dragster.
Here's a picture of it.
My point is that none of our engines are even going to come close to half that. Especially because we can only turn them up to about 3500 rpm before the prop tips go mach.
So reaching the engines structural limits with less than 200 HP at less than 4000 RPM is not some thing I am overly concerned about.
Sure freak things can happen.
The Original Crankshaft was constructed of 5140 chrome-moly steel.
5140 has an ultimate strength of 86,000 PSI.
4340 has an ultimate strength of 163,000 PSI.
So our new crankshaft is more than 50% stronger.
I don't know what the stack Corvair rods are made of but I bet it's not even a chrome-moly, probably just mild steel, I could be wrong but regardless our new rods are 4340.
On any engine that requires boring out the case for the cylinders I plan to remove and replace all the studs anyway. I must remove them to bore the case out and there is no point in putting old studs back in. I'm not out to save money at the cost of safety or reliability. Many people are afraid to mess with the studs but I have years of experience removing broken and stubborn studs.
I think that covered all your questions?
Sorry if I ramble don too much but I wanted to give you as many details as possible.
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Brady McCormick
Poulsbo, WA
www.magnificentmachine.com |
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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| Posted: Thu Feb 12, 2009 4:53 pm Post subject: Re: News from Magnificent Machine |
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Brady,
Thanks. That's a great reply. Lot's of good information for those considering the corvair. Unrelated, could you post smaller pictures? I guess that's why your post was stretched out a mile wide. I had to scroll back and forth a lot to read it.
Hope things are coming together.
Dan
do not archive
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Scratch building XL with Corvair Engine |
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