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Author Topic: Turbosung V2  (Read 21316 times)


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Re: Turbosung V2
« Reply #220 on: September 13, 2018, 09:05:15 AM »

But your forgetting the torque.

You're right,
I don't remember it having torque.

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Re: Turbosung V2
« Reply #221 on: December 19, 2018, 02:27:57 AM »

Thanks for all the tips I have the engine almost ready. Purchased the sv650 studs that you recommended.
Now I am looking into the oil for the turbo, where did you put the return line? The oil fill cap?


Eh?! The pictures are all back!

Did Photosuckit decide to give up on it's ransom demands??


No, piston or rod change. I wish I could find something that was suitable.

Regarding boost:

With the stock head bolts, you can only torque them to 50Nm. This will allow you to reach 6 - 8 psi before the head starts to pull away from the block. The bike made about 130rwhp on 8 psi. The stock head bolts are a very poor design. They are 10mm at the top and at the bottom, but narrow to just 8mm in the middle! They stretch very easily.

With APE head studs for an SV650, you can get a lot more torque on them as they are uniformly 10mm all the way along the bolt. With these studs you can tighten to 70Nm and can see 12 - 15psi before the head and the block start to come apart.

With 1/2" head studs, you can get 90Nm of torque and reach 20psi of boost. At 20psi, the bike was making 205rwhp on e85.

No pump was needed, a banjo bolt is added to a modified bolt and a 2mm restrictor is placed on the turbo side to prevent the turbo from taking all the oil flow. The oil pumps on these bikes are strong!

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