Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: ralf on Wednesday,September 21, 2022, 09:10:07 AM
-
Hello,
I swap the engine od my Europa to the TOYOTA 4AGE engine.
The 4AGE has its pulley for the alternator at the front of the engine which I don't like.
So I convert the 4AGE engine to a camshaft driven alternator pulley.
Therefor I let cast a aluminium bracket to hold an additional rollerbearing in the center if the pulley.
If you have a bearing in the center of the pulley you will not have a radial force by the V-belt to the extension of pulleyshaft.
-
Very interesting! There aren't many (any?) of us who cast our own parts! :welder:
-
The cylinderhead and valvecover need an opening for the O-ring area of this bracket. because I dont have a big milling mashine I used a manual Hunger valveseatcutter. A guide was made to position the cutter in the center of the camshaft.
-
On my 4AGE I use a non original valve cover. With he Hunger I cut the bore in the head and the cover fixed together.
-
The finished bore looks like this.
-
At the cylinderheadside of the bracket there is diameter with an O-ring.
-
At the inner of the other side of the bracket there is a bearing hold in axial position by a ring and a seal (not at the picture)
-
The bracket is fixed at three points to the rear of the cylinderhead
-
The pulley is from a frensh 50ccm motorbike. To position the V-Belt at a level with the bearing a adaptor was made snd screwed to the pulley.
-
The conection of the pulley should be flexible. So I made a adapter which could at the one side pressed to the camshaft. At the other side a cut sproket of a Honda CB50 was fitted.
-
Nice work Ralf!
-
Very nice indeed!
-
Thanks,
the adapter is pressed to the camshaft and additionaly fixt with a 4mm pin which was fixed by a laser weld.
-
The pressed in sprocket was also fixed with three laser spots.
-
The outside of the camshaft extension is made by the shortened transmission shaft of a 1978 Honda CB50 (same shaft like the XL75/80 XR80.. which was sold in the US) and a adapter.
-
At the outer side at the extension a rubber ring was mounted to prevent a oil leakage between the extension and the pulley. A seal is installed into the bracket.
-
The rear opening for at the cylinderhead is closed by the bracket and sealed with silicone.
-
8)
-
Stellar job, Ralf! :beerchug:
-
Thanks,
the bracket is fitted with two bolts and one strud.
-
The pulley is axial fixed a 5/16UNF bolt and tangential with a M6 wormscrew.
-
This picture shows the drive of the pulley
-
To fix the alternator a spezial boltwas made. This is screwed thru the bellhousing and adapterplate.
The outside of the bolt has a 10mm cylindtical diameter and a inner 5/16UNF thread to fix the alternator.
-
The alternator is from a Citroen 2CV. The bracket to tighten the V-belt is still missing.
-
Today I finished the bracket to tighten the V-belt.
-
Very nice! It looks like the inside of a watch!
-
8)
-
Nice work. Very impressive craftsmanship.