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RE: Echo BME twin - 3/10/2007 3:09:25 AM   
Herby 1


 

Posts: 10
Joined: 4/26/2003
From: Northern Arizona
Status: offline 		My block is 3/4 thick, bolted to a 1" thick x 5 inches wide with 1/2" allen bolts..It's a T, with holes in one side for G38 size cranks and the other side for G62 size cranks..it fits in my Kurt vise on the mill table...Most lathe chucks are not good enough to check alignment within .001, so the block was the answer...It's about 12 years old.....

(in reply to captinjohn)
       Post #: 76

RE: Echo BME twin - 3/10/2007 3:44:32 AM   
captinjohn


 

Posts: 6266
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: online 		RCIGN1: Got a question. What is the best way to make this. Drill close... then finish bore with??? Also would high grade aluminum work ok in place of steel?? Thanks Capt,n

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I never met a engine I did not like !

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       Post #: 77

RE: Echo BME twin - 3/10/2007 4:49:34 AM   
tim220225



Posts: 964
Joined: 1/17/2004
From: Mobile, AL, USA
Status: offline 		Hey Ralph, how about a picture or two??

(in reply to Herby 1)
       Post #: 78

RE: Echo BME twin - 3/10/2007 6:05:36 AM   
Herby 1


 

Posts: 10
Joined: 4/26/2003
From: Northern Arizona
Status: offline 		Steel is best...The holes gradually get elongated with use...This thing is so old now that the holes are getting oval...Still works, but not as well as it did..pictures tomorrow, it looks pretty bad...

(in reply to captinjohn)
       Post #: 79

RE: Echo BME twin - 3/10/2007 2:43:31 PM   
captinjohn


 

Posts: 6266
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: online 		It will be interesting when you get the engine together enough to use a dial indicator to see if both pistons come up to Top Dead Center at same time!! I hope she does. Capt,n

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I never met a engine I did not like !

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       Post #: 80

RE: Echo BME twin - 3/11/2007 2:43:59 AM   
tkg


 

Posts: 2203
Joined: 1/6/2002
From: Riverton, WY, USA
Status: offline 		Don't need a dial indicator. Just shine a light in the spark plug hole and look in the exhaust port. If both cylinders go dark at the same time you got it. If not a feeler gauge will tell you how far off you are.

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TKG
To much power is just about right.

(in reply to captinjohn)
       Post #: 81

RE: Echo BME twin - 3/11/2007 3:26:35 AM   
captinjohn


 

Posts: 6266
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: online 		That assuming ports are identical height in both cylinders and base gaskets are exact ect...ect are exact. I like a dial indicator. Capt,n

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I never met a engine I did not like !

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       Post #: 82

RE: Echo BME twin - 3/11/2007 5:28:10 AM   
tkg


 

Posts: 2203
Joined: 1/6/2002
From: Riverton, WY, USA
Status: offline 		Its the port timing that counts. The gasket and deck heigth will both effect the dial indicator.

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TKG
To much power is just about right.

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       Post #: 83

RE: Echo BME twin - 3/11/2007 6:06:20 AM   
Ralphbf



Posts: 1249
Joined: 3/15/2004
From: Woodland, CA, USA
Status: offline
quote:

ORIGINAL: tkg

Its the port timing that counts. The gasket and deck heigth will both effect the dial indicator.


I believe it will be the same exact port timing that counts.
Unless the port timing is matched the engine will not be optimized.
Deck height needs to be maintained so the compression raitos will be he same.

It should not be hard to do, it's just another small detail that needs to be taken care of.


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Ralph

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       Post #: 84

RE: Echo BME twin - 3/11/2007 5:10:27 PM   
av8tor1977



Posts: 2777
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline 		I was thinking of making the interface between the crankshafts a shrink fit on mine, so that indexing could be checked and set before welding...

AV8TOR

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If it's not scary, it's NOWHERE NEAR powerful enough!!

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       Post #: 85

RE: Echo BME twin - 3/11/2007 10:16:40 PM   
av8tor1977



Posts: 2777
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline 		Did that money order arrive for you yet airbornrc ?

AV8TOR

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If it's not scary, it's NOWHERE NEAR powerful enough!!

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       Post #: 86

RE: Echo BME twin - 3/12/2007 1:29:29 AM   
captinjohn


 

Posts: 6266
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: online
quote:

ORIGINAL: tkg

Its the port timing that counts. The gasket and deck heigth will both effect the dial indicator.

It seems like the base gasket and the deck heigth will also affect port timing and dial indicator. Most likely if ports are in time with each other....the top dead center will be very close too. Well if she runs good...thats all that counts. Well except for if its kinda heavy...thats not good!!! Capt,n

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I never met a engine I did not like !

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       Post #: 87

RE: Echo BME twin - 3/12/2007 2:02:03 AM   
av8tor1977



Posts: 2777
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline 		Well, a twin will never weigh less than a similar size single cylinder engine at least in theory, but it sure is cool!!



AV8TOR

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If it's not scary, it's NOWHERE NEAR powerful enough!!

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       Post #: 88

RE: Echo BME twin - 3/12/2007 11:58:12 PM   
airbornrc


 

Posts: 170
Joined: 2/13/2003
From: olympia, WA, USA
Status: offline 		av8tor. The money order has not made it as of Saturday. I am out of town till Wednesday.

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Mark Anderson

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       Post #: 89

RE: Echo BME twin - 3/19/2007 4:33:05 PM   
airbornrc


 

Posts: 170
Joined: 2/13/2003
From: olympia, WA, USA
Status: offline 		Av8tor
I dropped off your parts at the post office This morning.

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Mark Anderson

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       Post #: 90

RE: Echo BME twin - 3/19/2007 4:51:16 PM   
tim220225



Posts: 964
Joined: 1/17/2004
From: Mobile, AL, USA
Status: offline 		Mark, have you been able to run your twin yet?

Tim

(in reply to airbornrc)
       Post #: 91

RE: Echo BME twin - 3/19/2007 5:07:33 PM   
av8tor1977



Posts: 2777
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline 		airbornrc Thanks!!

I almost went out to the workshop to work on my twin last evening, but I was just too tired and lazy. I've been making myself leave it alone until I finish up a few other projects already in the works. One of these days soon...

AV8TOR

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If it's not scary, it's NOWHERE NEAR powerful enough!!

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       Post #: 92

RE: Echo BME twin - 3/20/2007 6:11:41 PM   
airbornrc


 

Posts: 170
Joined: 2/13/2003
From: olympia, WA, USA
Status: offline 		I had to get some customer fiberglass work out and have not gotten the crank pinned. I also need to get an ignition.

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Mark Anderson

(in reply to av8tor1977)