Quote:
Originally Posted by Larry Herman
Very nice work. 2 quick questions about your motor, if I may:
1) I assume that the reversion that you mentioned is eliminated due to the extremely short intake runners?
2) What are the holes in the cylinder sleeves for?
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Larry, the reversion issue is eliminated for part throttle operation because there's a big throttle blade right there. The overall length of the intake tract isn't important. A typical ITB engine has the throttles almost completely closed during most cruising, more so with a big engine. Both the proximity of the throttle to the valves and the very fact that there's one for each cylinder are factors.
If you have 2 different engines with ample valve duration, one with ITBs and one without, the ITBs will have a smoother idle without the lope and light throttle driveability will be better.
The holes in the sleeves are to allow coolant to flow freely.