Me and my friend are using STS engines for our buggies.
Even the D21E are quite stable even when bashing up to 170*C (so far, touch wood).
For $8xx these STSs can be a really good bargain.
Ran the engine with 16, 20 and 30% nitro,
hot, medium and cold plugs,
and they all seemed to run very stable.
Only a minor leak in the backplate,
simple fix with a backplate gasket. |