Topic: Vanguard 23hp airflow restrictions?

[thompsoncustom]

Just wanted your guys thoughts on where the most improvement can be made on the intake for a 23hp vanguard.

Im thinking either the elbow or double barrel carb is probably the most restictive point in the system. Anyone open either of these up and see a noticeable difference? I plan on matching the intake to the heads and figured id look for other airflow improvements.

No class restrictions on this motor btw.

[Michaelgc7]

The biggest air flow restriction on the 21-23hp engines is the intake itself. Even with mild 33-27.5 ported heads the intake ports will greatly out flow the intake. The only way to make decent power with stock parts is to extrusion hone the intake to get around 110 cfm. Cromwell race engines can do that for you. If you want big hp then you need to discard that and make a custom intake or dual intakes for dual carbs. Hope this helps.

[thompsoncustom]

Thanks that's exactly the kind of info I was looking for.

[Michaelgc7]

My pleasure. For race ready heads check out carrierperformance.net