400BB question
06-05-2017, 08:40 AM
#31
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I would way rather build it myself and get grey hairs then pay someone money to play around with my engine, that money is better spent on parts!
06-13-2017, 04:12 PM
#32
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Well I found a machine shop that will mill and port my heads, they just need some more info on how far to cut. So from what ive gathers;
80CC in combustion chamber
1.81 / 2.14 SS valves
Blend bowls?
Any more specific info I can give them?
I will get a new cam if needed (or get them to measure the cam when I take the heads off)
80CC in combustion chamber
1.81 / 2.14 SS valves
Blend bowls?
Any more specific info I can give them?
I will get a new cam if needed (or get them to measure the cam when I take the heads off)
06-13-2017, 07:37 PM
#33
Mopar Lover
PH -
Talk to the guy who's working over your engine. 80cc is fine OR it may raise the compression too much. Milling down the heads is also fine, but plan on milling the intake as well.
If you really want to enjoy that engine after it's in the vehicle, you have to build it as a unit, meaning the cam, heads (compression), intake (the tunnel ram will be problematic), rear, etc, etc have to work together.
See what you engine guy says, and then talk to Fred at Comp Cams.
You may or may not like what he tells tells you
Archer
Talk to the guy who's working over your engine. 80cc is fine OR it may raise the compression too much. Milling down the heads is also fine, but plan on milling the intake as well.
If you really want to enjoy that engine after it's in the vehicle, you have to build it as a unit, meaning the cam, heads (compression), intake (the tunnel ram will be problematic), rear, etc, etc have to work together.
See what you engine guy says, and then talk to Fred at Comp Cams.
You may or may not like what he tells tells you
Archer
06-13-2017, 09:31 PM
#34
Super Moderator
Here is what you do so you DO NOT have to mill the intake, for every .010" removed from the cylinder face you remove .0123 from the intake side of the head....
With the deck height of.080, a 400 with 80 cc heads will have a compression ratio of 8.86 to 1 with a .020 steel head gasket.
A cam with 240 degrees of duration @ .050 lift or less will work with that compression ratio. The problem is the stock pistons are good for only 5000 to 5500 rpm so you need a cam that works within those limits.
With the deck height of.080, a 400 with 80 cc heads will have a compression ratio of 8.86 to 1 with a .020 steel head gasket.
A cam with 240 degrees of duration @ .050 lift or less will work with that compression ratio. The problem is the stock pistons are good for only 5000 to 5500 rpm so you need a cam that works within those limits.
06-14-2017, 08:38 AM
#35
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Thanks for the info guys, yes I know I have limited knowledge in engine building, all I've ever done (helped with) is stock stuff and then just intakes and carbs. I've never had the chance to get into the nitty gritty. So I apologize for the entry level questions
06-14-2017, 09:19 AM
#36
Mopar Lover
PH -
That's fine. Just remember, none of us here can see what you have, nor know what was previously done to it. Make sure the local guy you're using has a good rep with Mopar stuff and work out the details with him.
Archer
That's fine. Just remember, none of us here can see what you have, nor know what was previously done to it. Make sure the local guy you're using has a good rep with Mopar stuff and work out the details with him.
Archer
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