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Engine basics => Engine set up tips => Topic started by: Allan Perret on December 09, 2017, 03:35:28 PM
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So can you drop LA46 piston & sleeve into the 40 case ? If so, are the p&s from RC engine same as the CL engine ?
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No. The VF 40-46 are interchangeable.
Jerry
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The LA.40 and .46 use the same case, but you can NOT swap cylinder liners between them because of the difference in the O.D of the liners. That is why the .46 is a bit lighter than the .40, because more metal has been removed to let the bigger liner fit. The R/C and C/L versions of both the engines are the same within the displacement. The only difference being the carb on the R/C version and the venturi on the C/L version. There has been MUCH written here on the forums on parts interchange over the years and can be found with the search feature.
Type at you later,
Dan McEntee
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The LA.40 and .46 use the same case...
They look similar, but at least the one 40LA that I have is about 1/8" shorter in the snout than my two 46LAs.
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They look similar, but at least the one 40LA that I have is about 1/8" shorter in the snout than my two 46LAs.
Snout?
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The case is very similar but not the same.
The head bolts on the 40 are closer together, the case is bored for the smaller p &l
To fit the 46 parts you would need to fill the head bolt holes with aluminum and redrill and tap for the 46 head bolt location, then bore out the case to take the larger p & l.
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They look similar, but at least the one 40LA that I have is about 1/8" shorter in the snout than my two 46LAs.
That's somewhat surprising since they use the same crankshaft and thrust washer
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That's somewhat surprising since they use the same crankshaft and thrust washer
I'm gonna have to go check now.
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Yeah, Tim's probably thinking about something else being shorter now... :-[
I put one of my .46LA's into the Skylark that Don McClave had a .40LA in, and Jerry Eichten raffled off with a .40FP in it. Same snout length. The head bolt pattern is indeed different. Way more trouble than it's worth, anyway.
B.Y.U. ..."snout" = "nose", "shaft", or "front end". :! Steve
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They are the same mount and outside dimensions, BUT they are NOT the same case, the 46 has its own piston sleeve head wrist pin , gasket set and case, The crank shaft is the same for the 35 40 FP 40 46 LA.
The VF 40 and 46 uses BOTH a different piston/sleeve set, head, and crankshaft
Regards
Randy