Project No. 11
WL Engine Rebuild & Tuning
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It all started when Steve came to me and told me that his son needs a school project and he likes to rebuild an engine. He asked me whether I have an old engine that needs some rebuild. I sure do, was my answer. I had the rotten WL engine sitting in my garage for quite a while. It was a cheap buy on e-bay and
it was sure in a bad contition. The right thing for a school
project:-) |
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| The Rebuild |
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| After cleaning the rebuild can begin. The cases needed some new races and they had to be lapped in. |
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I still decided to buy new ones and since we do that we should get some stroker ones! Victory Library sells a whole variety of stroker flywheels for 45's. We got the 4-7/16" this results in 861cc with STD pistons. A set of new connecting rods, new shafts and crank pin were used. Next step is the balancing
of the crank: |
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55% was used as balancing factor. After both wheels are balanced the crank shaft can be assembled and trued. I use my old Schäublin 102 lathe to do so. |
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Because of the longer stroke the clearance between rods, cases and cylinders has to be checked and material needed to be removed....
.... on cases and
cylinders |
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The cylinders needed new seats for the valves. The Schäublin can be used for this job as well. |
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Since we have more stroke now, why not doing some more to enhance power. A deck relieve adds the most (nice pictures of relieved cylinders can be found on www.beautyofspeed.com.
All the blue area has to go to
give better flow. |
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Also all the ports and the manifold where reliefed and cleaned. |
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The cylinders are bored to 0.070" over and stroker pistons from Victory Library where used. With the bigger stroke this results in 905cc (55.23") |
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| Done: quite a difference from the initial state;-) |  |
| And in the bike: She is running very well!!
If you like to comment on this project you can visit my post on the Flathead Power Tech Talk |
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