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Bobcat 721 engine options
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<blockquote data-quote="kylem1" data-source="post: 104541" data-attributes="member: 16752"><p>Here it is Hello, good news, the transplant is complete (minus the air filter hook up and the up piping for the exhaust). I added some photos under bobcat 721 repower, including the flywheel being machined. If anyone wants to do this job, it's not bad. The motor dimensions are nearly identical. The bolt holes for the motor mounts, the height of the pump shaft to the yoke of engine and the depth of the engine are the same. Here are a few issues I ran into. The intake and exhaust are plumbed different from the 411 to 511. I cut the exhaust outlet off, plugged it, cut a hole on the opposite end and welded on an outlet. The intake still needs some thought. Also, the exhaust hit the side wall and a piece about 2" by 18" was cut out, this is the only body modification I did. I could have did some cutting and welding with muffler itself, but decided not to mess with it. The 511 flywheel is 1/4" bigger than the 411 so about 3/16" had to be shaved off the top of the rear motor mount. Other things, the oil drain plug is in a different place (The 411 is in the middle/bottom of the engine, the 511 is near the flywheel, back right as you are facing it) I'm buying a barbed fitting and connecting that to a hose with a cap to make oil changes easier. It has more power and turns smoother than before, runs good, I'm happy with it. Here are few of the costs, the 511 cost $2250 and the machine work cost $387. The prices range a lot, I have seen them for $1500 and there is one on ebay for $6000. As far as the 411 rebuild would have looked like, I found pistons and rings for about 900 euros from an ebay seller in German. The cylinder jugs are around $1000 for both. So, the cost was about the same. I'll play with the 411 and see if I can get it running a little better this winter. The nice thing is that rebuild kits for the 511 are available and at a reasonable price. Thanks for your support.</p></blockquote><p></p>
[QUOTE="kylem1, post: 104541, member: 16752"] Here it is Hello, good news, the transplant is complete (minus the air filter hook up and the up piping for the exhaust). I added some photos under bobcat 721 repower, including the flywheel being machined. If anyone wants to do this job, it's not bad. The motor dimensions are nearly identical. The bolt holes for the motor mounts, the height of the pump shaft to the yoke of engine and the depth of the engine are the same. Here are a few issues I ran into. The intake and exhaust are plumbed different from the 411 to 511. I cut the exhaust outlet off, plugged it, cut a hole on the opposite end and welded on an outlet. The intake still needs some thought. Also, the exhaust hit the side wall and a piece about 2" by 18" was cut out, this is the only body modification I did. I could have did some cutting and welding with muffler itself, but decided not to mess with it. The 511 flywheel is 1/4" bigger than the 411 so about 3/16" had to be shaved off the top of the rear motor mount. Other things, the oil drain plug is in a different place (The 411 is in the middle/bottom of the engine, the 511 is near the flywheel, back right as you are facing it) I'm buying a barbed fitting and connecting that to a hose with a cap to make oil changes easier. It has more power and turns smoother than before, runs good, I'm happy with it. Here are few of the costs, the 511 cost $2250 and the machine work cost $387. The prices range a lot, I have seen them for $1500 and there is one on ebay for $6000. As far as the 411 rebuild would have looked like, I found pistons and rings for about 900 euros from an ebay seller in German. The cylinder jugs are around $1000 for both. So, the cost was about the same. I'll play with the 411 and see if I can get it running a little better this winter. The nice thing is that rebuild kits for the 511 are available and at a reasonable price. Thanks for your support. [/QUOTE]
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