Who to have Port Your head???
#51
01-25-2006, 09:48 PM
Who to have Port Your head???
Originally posted by: 650VIPER
Bigshow, how did the duals compare to the 48hv?
Bigshow, how did the duals compare to the 48hv?
#52
01-25-2006, 10:43 PM
Who to have Port Your head???
You bet it did. I have been looking at going to duals with the porting. I rode Dunemes 760 with fcr's and it ran great. I would like to just upgrade to the 48, but am looking at doing dual 38 lectrons from Eric. So maybe....... if its the design of the carb......... maybe they would give that good flat curve, and give a higher peak number. Hmmm, that man in the camo coat and glasses needs to get his pencil alittle sharper, this is starting to add up. Thanks Bigshow.
#53
01-26-2006, 05:19 AM
Who to have Port Your head???
Originally posted by: MisterHP
Here's some puzzling questions to ask about porting.
I wonder whats better about big valves? You would think the air would have a bigger obsticle to get around as it tries to get into and out of the chamber.
Do giant ports make more bottom end power or topend power? They usually seem to lose bottom end power I wonder why?
If a head has big ports shouldn't it have cams to match? If you got big ports you need big cams to get the most out of the porting right.
Is it possible to gain bottom and top end out of porting? How could that be possible?
What really causes an engine to gain power from porting? Shouldn't the porting be smaller to gain velocity and get the air in faster?
Here's some puzzling questions to ask about porting.
I wonder whats better about big valves? You would think the air would have a bigger obsticle to get around as it tries to get into and out of the chamber.
Do giant ports make more bottom end power or topend power? They usually seem to lose bottom end power I wonder why?
If a head has big ports shouldn't it have cams to match? If you got big ports you need big cams to get the most out of the porting right.
Is it possible to gain bottom and top end out of porting? How could that be possible?
What really causes an engine to gain power from porting? Shouldn't the porting be smaller to gain velocity and get the air in faster?
Larger porting can increase hp top and bottom if the components you run can utilize the additional volume of air to its full efficiency. But if your tracks are too large you loose velocity and therefore the charge going into the chamber will slow causing more air to enter the head but at a slower rate. This typically gives you less torque.
Typically larger valves = increased surface area.
cams match porting...
porting should be done to suit the customer. If he/she wants a bottom end motor you adjust your configuration to accomidate him. Its like comparing a mx motor to a hill motor. That was kind of a silly question...
some of these questions were kind of repeatitive and honestly...pretty obvious. I wouldnt have replied if i didnt feel the members could benefit a little from the answers. If anybody has any questions you can PM me with your inquiries. Im not always around the bomb forum so i might miss some replies.
As for the original question stick to a builder that will treat you right and try to work with you. That is the only advice i can give.
#55
01-26-2006, 03:20 PM
#56
01-26-2006, 03:28 PM
Who to have Port Your head???
Dabeechman
No disrespect intended but none of those answers helped me at all. They were relative platitudes with nothing specific on how it works, why it works and what you do to make it work.
I know you know how porting works and what bigger valves do for us. How specifically do you create more cylinder pressure and improved VE with large ports at low rpm? The question assumes that the components match.
2nd question, why would you ever need valves that are larger than the smallest area in your port job? Would that be matched componentry?
No disrespect intended but none of those answers helped me at all. They were relative platitudes with nothing specific on how it works, why it works and what you do to make it work.
I know you know how porting works and what bigger valves do for us. How specifically do you create more cylinder pressure and improved VE with large ports at low rpm? The question assumes that the components match.
2nd question, why would you ever need valves that are larger than the smallest area in your port job? Would that be matched componentry?
#57
01-26-2006, 03:28 PM
Who to have Port Your head???
viper it was right under 400ft. it was the best mod i ever did. it seemed to make everything work together.
my father used to build motors for race sleds so i watched and learned.
dabeech has very good info.
pretty much what he said.
sorry if i dont go into detail with this issue. im not a big typer.
my father used to build motors for race sleds so i watched and learned.
dabeech has very good info.
pretty much what he said.
sorry if i dont go into detail with this issue. im not a big typer.
#58
01-26-2006, 04:06 PM
#59
01-26-2006, 04:17 PM
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#60
01-26-2006, 04:54 PM
Who to have Port Your head???
no disrespect taken. From the looks of your sig it seems as though you've spent a lot of money with hpr. You should really consider asking your builder since all of our theories will vary some. But you'll be hard pressed to find anybody that is willing to go into detail on the very specifics of what makes a motor run. If so you guys wouldnt neeed hpr, kenz, ect.