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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Off the shelf cam options for marine engines (https://www.offshoreonly.com/forums/general-q/334544-off-shelf-cam-options-marine-engines.html)

Panther 02-24-2016 10:45 PM
Originally Posted by SB (Post 4408220)
Almost the end of page 64 and we are now on flat tappets. Did we go so far we hit a time warp of 12-15 yrs ?
Pretty soon we'll all be running Peanut Port heads!

vintage chromoly 02-25-2016 05:12 AM
Originally Posted by mike tkach (Post 4408164)
i don,t think it will make 450.what was the factory hp rating?
365, but we all know those "ratings" from the big three in that era were all over the map.
Really, it's not a race car. I just can't leave anything alone so I started foolng with it and wound up with ported intake, heads and a solid cam.

It was good to go through it as we found a few suspect assembly things we fixed. (Junky//bend oil pump pickup, distributor bushing in the block spun, # 2 cam bearing was gone)

sutphen 30 02-25-2016 06:34 AM
Originally Posted by Panther (Post 4408240)
Pretty soon we'll all be running Peanut Port heads!
w/ either 2 barrel carbs or tbi,,gotta get that port velocity super super sonic,,ludicrous speed.scotty,I need more speed,,Captain,I've given her all sheee's got,she can't takes anymore.:D

sutphen 30 02-25-2016 06:38 AM
Originally Posted by vintage chromoly (Post 4408145)
9.25 to 1.
906 Chrysler heads

This is a numbers matching engine for a 39,000 original miles car, so the idea was to keep it simple, cost effective and reliable. It's an ice cream cone getter.
I have a nice engine package for the big block chryslers.will see if I can find the paperwork.also did a nice stroker sb chry for my brothers AAR cuda.

Mr Maine 02-25-2016 07:46 AM
Originally Posted by sutphen 30 (Post 4408270)
w/ either 2 barrel carbs or tbi,,gotta get that port velocity super super sonic,,ludicrous speed.scotty,I need more speed,,Captain,I've given her all sheee's got,she can't takes anymore.:D
Speaking of this, how high do port velocities get? A 2x2 inch port that flows 400cfm would have a velocity of 240 ft/sec. What if with a blower you sped this up to break the sound barrier? Would the engine just sonic "BOOM"?

kvogt 02-25-2016 08:04 AM
Originally Posted by Mr Maine (Post 4408285)
Speaking of this, how high do port velocities get? A 2x2 inch port that flows 400cfm would have a velocity of 240 ft/sec. What if with a blower you sped this up to break the sound barrier? Would the engine just sonic "BOOM"?
Ports never go past the speed of sound. But that is variable based on localized density and temperature..

Panther 02-25-2016 08:06 AM
Originally Posted by Mr Maine (Post 4408285)
Would the engine just sonic "BOOM"?
Might sound something like this?
https://youtu.be/aRMpi1esjoQ

SB 02-25-2016 08:35 AM
Originally Posted by Mr Maine (Post 4408285)
Speaking of this, how high do port velocities get? A 2x2 inch port that flows 400cfm would have a velocity of 240 ft/sec. What if with a blower you sped this up to break the sound barrier? Would the engine just sonic "BOOM"?
Not if you lined the ports with sound deadener.

Trash 02-25-2016 10:26 AM
Originally Posted by Mr Maine (Post 4408285)
Speaking of this, how high do port velocities get? A 2x2 inch port that flows 400cfm would have a velocity of 240 ft/sec. What if with a blower you sped this up to break the sound barrier? Would the engine just sonic "BOOM"?
The port velocity won't break the sound barrier.

phragle 02-25-2016 10:31 AM
Originally Posted by Trash (Post 4408363)
The port velocity won't break the sound barrier.
You just need to up the boost to something like 4000% overdriven, This can be accomplished by adding a 63 speed overdrive transmission to the blower.


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