Re: M&H Flat head
Posted by Ozstatman On 2012/1/20 21:03:44
My take on making reasonable increases in horsepower and RPM's on a straight eight 327 Packard engine would be along these lines:
1) Rebuild the engine from the ground up.
2) Use new parts in the rebuild
3a) Increase the compression. First choice, if in the budget, is new custom made pistons.
3b) Bore 0.040" or 0.060" over to increase the displacement and to reduce the undersquare equation somewhat.
3c) If not, use a 288 head on the 327.
4) Regrind the cam, old time cam grinders should know what grind will suit your requirements.
5a) Improve the breathing with bigger intake valves, leave exhaust stock.
5b) A real good port and polish job together with port matching to the manifolds.
6b) Improve Carburettion, use a 4bbl manifold with an adapter using, say, a Holley carb.
6b) If you're very very lucky, might find an Edmunds or other dual carb manifold.
6c) Make your own manifold! 3 side draft carbs, your choice, one for each intake port.
7) Make your own exhaust manifold. You'll want to improve the flow out as well as the flow in!
8) Lighten the reciprocating weight as much as possible, within reason.
9) Explore the oil pump and oiling system and improve if possible.
10) Explore electronic ignition systems or other ignition system improvements. My choice would be a magneto!
11) Go drive and enjoy your hopped up Packard!
Could do the same things to a 120 or the Six/110 engine too.
Pic ex Webshots Site.
Attach file:
(32.02 KB)
1) Rebuild the engine from the ground up.
2) Use new parts in the rebuild
3a) Increase the compression. First choice, if in the budget, is new custom made pistons.
3b) Bore 0.040" or 0.060" over to increase the displacement and to reduce the undersquare equation somewhat.
3c) If not, use a 288 head on the 327.
4) Regrind the cam, old time cam grinders should know what grind will suit your requirements.
5a) Improve the breathing with bigger intake valves, leave exhaust stock.
5b) A real good port and polish job together with port matching to the manifolds.
6b) Improve Carburettion, use a 4bbl manifold with an adapter using, say, a Holley carb.
6b) If you're very very lucky, might find an Edmunds or other dual carb manifold.
6c) Make your own manifold! 3 side draft carbs, your choice, one for each intake port.
7) Make your own exhaust manifold. You'll want to improve the flow out as well as the flow in!
8) Lighten the reciprocating weight as much as possible, within reason.
9) Explore the oil pump and oiling system and improve if possible.
10) Explore electronic ignition systems or other ignition system improvements. My choice would be a magneto!
11) Go drive and enjoy your hopped up Packard!
Could do the same things to a 120 or the Six/110 engine too.
Pic ex Webshots Site.
Attach file:
(32.02 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=93289