Does anyone have port and polished heads
#1
Does anyone have port and polished heads
I was wondering if anyone here had there heads ported and polished and if it had any decent gains, since my motor is screwed I figure I can port the heads I put on it when I finally get motor.
#2
Re: Does anyone have port and polished heads
Originally posted by TILLEYS99
I was wondering if anyone here had there heads ported and polished and if it had any decent gains, since my motor is screwed I figure I can port the heads I put on it when I finally get motor.
I was wondering if anyone here had there heads ported and polished and if it had any decent gains, since my motor is screwed I figure I can port the heads I put on it when I finally get motor.
#3
#4
Originally posted by clee130
http://forums.maxima.org/showthread.php?threadid=72447
http://forums.maxima.org/showthread.php?threadid=72447
#5
Originally posted by clee130
http://forums.maxima.org/showthread.php?threadid=72447
http://forums.maxima.org/showthread.php?threadid=72447
I have talked to Dan Parmore Racing (DPR) about this. They claim to have dome one set of Maxima heads. Dan said theyr was room for improvment. I dont know who the heads belonged to. It wasnt Mathel, so I think its a particullar Texan who is understandably secrative about forking out big bucks for performance mods.
If you send the heads to a reputible performance machine shop like DPR, they "clam" that for $2500 they can get you a 15-20% gain in power. They will do allot more than port and polish. As an example...
Flow bench with port and polish
Unshroud the valves
High flow valve job
Weld and reshape the combustion chamber
Coat the combustion chamber and valves with heat disapating ceramics
Port match the in/out ports with manifolds.
I think 10-15% is more resonable...
For a boosted car making 275fwhp they could be worth 27.5-41.25fwhp.
Dollar per horse power thats very expensive, even at the best case of 15% you are paying $60.60 per FWHP. A V2 SC at $4000.00 makes ~65fwhp on the stock pulley for $61.53 per hp. A CAI or Y pipe is about $30 per hp.
If you have the money to get it done professionally then do it.
FWIW Just getting the combustion chamber and valves coated is not too expensive and will yield some power on a boosted car.
IHMO of course...
#9
thanks MardiGrasMax Im planning on going boosted and I have a friend who has a bench flow thingy and will do them fairly cheap. For those of you who want to know what happened go here
Window switch a must for NOS on an automatic
Window switch a must for NOS on an automatic
#11
Turtle turtle... Moderator
iTrader: (25)
Join Date: Aug 2000
Location: San Bruno, Petaluma, SF Bay area
Posts: 4,857
Re: Does anyone have port and polished heads
Originally posted by TILLEYS99
I was wondering if anyone here had there heads ported and polished and if it had any decent gains, since my motor is screwed I figure I can port the heads I put on it when I finally get motor.
I was wondering if anyone here had there heads ported and polished and if it had any decent gains, since my motor is screwed I figure I can port the heads I put on it when I finally get motor.
#12
Re: Re: Does anyone have port and polished heads
Originally posted by Turbo95Max
I chose not to get 5 angle valvejob due to the drawbacks that are associated with them.
I chose not to get 5 angle valvejob due to the drawbacks that are associated with them.
#13
Originally posted by TILLEYS99
thanks MardiGrasMax Im planning on going boosted and I have a friend who has a bench flow thingy and will do them fairly cheap. For those of you who want to know what happened go here
Window switch a must for NOS on an automatic
thanks MardiGrasMax Im planning on going boosted and I have a friend who has a bench flow thingy and will do them fairly cheap. For those of you who want to know what happened go here
Window switch a must for NOS on an automatic
SuDZ
#14
Re: Re: Re: Does anyone have port and polished heads
Originally posted by MardiGrasMax
Can you elaborate please Mathel? Is it a wear issue?
Can you elaborate please Mathel? Is it a wear issue?
Also,
Matt-
I'm thinkin of runnin NOS too, know where I could get the wet setup done to my intake manifold while its off the car?
Thanks
-Mike
#15
Re: Re: Re: Re: Does anyone have port and polished heads
I would talk to Tony "1MAX2NV" about the profogger plumbing. His shop did a nice job.
Originally posted by Screaminfast
Yes, I'd also like to know why the 5 angle valve job isn't a good idea. I was plannin to do that too.
Also,
Matt-
I'm thinkin of runnin NOS too, know where I could get the wet setup done to my intake manifold while its off the car?
Thanks
-Mike
Yes, I'd also like to know why the 5 angle valve job isn't a good idea. I was plannin to do that too.
Also,
Matt-
I'm thinkin of runnin NOS too, know where I could get the wet setup done to my intake manifold while its off the car?
Thanks
-Mike
#16
Turtle turtle... Moderator
iTrader: (25)
Join Date: Aug 2000
Location: San Bruno, Petaluma, SF Bay area
Posts: 4,857
Re: Re: Re: Does anyone have port and polished heads
Originally posted by MardiGrasMax
Can you elaborate please Mathel? Is it a wear issue?
Can you elaborate please Mathel? Is it a wear issue?
im not sure but i think the Maxima stock already is a 3 angle valve job.
#17
Re: Re: Re: Re: Does anyone have port and polished heads
From my understanding, it also increases wear as the valve seat now has a smaller area to contact when closing each time. so less area to accept the pounding = accerlated wear on the seat.
Originally posted by Turbo95Max
5 angle valve job is not necessary the best for street use cause of possible excessive carbon buildup. The more angles has more places and tendancy for carbon to buildup. Too much carbon buildup and you can get low compression and other probs. Im sure there are more technical ways to explain this but this is in my own words....
im not sure but i think the Maxima stock already is a 3 angle valve job.
5 angle valve job is not necessary the best for street use cause of possible excessive carbon buildup. The more angles has more places and tendancy for carbon to buildup. Too much carbon buildup and you can get low compression and other probs. Im sure there are more technical ways to explain this but this is in my own words....
im not sure but i think the Maxima stock already is a 3 angle valve job.
#18
Woooooah, you been talking to the bean counters?
Originally posted by MardiGrasMax
I think 10-15% is more resonable...
For a boosted car making 275fwhp they could be worth 27.5-41.25fwhp.
Dollar per horse power thats very expensive, even at the best case of 15% you are paying $60.60 per FWHP. A V2 SC at $4000.00 makes ~65fwhp on the stock pulley for $61.53 per hp. A CAI or Y pipe is about $30 per hp.
I think 10-15% is more resonable...
For a boosted car making 275fwhp they could be worth 27.5-41.25fwhp.
Dollar per horse power thats very expensive, even at the best case of 15% you are paying $60.60 per FWHP. A V2 SC at $4000.00 makes ~65fwhp on the stock pulley for $61.53 per hp. A CAI or Y pipe is about $30 per hp.
#20
Re: Re: Re: Re: Does anyone have port and polished heads
Originally posted by Turbo95Max
5 angle valve job is not necessary the best for street use cause of possible excessive carbon buildup. The more angles has more places and tendancy for carbon to buildup. Too much carbon buildup and you can get low compression and other probs. Im sure there are more technical ways to explain this but this is in my own words....
im not sure but i think the Maxima stock already is a 3 angle valve job.
5 angle valve job is not necessary the best for street use cause of possible excessive carbon buildup. The more angles has more places and tendancy for carbon to buildup. Too much carbon buildup and you can get low compression and other probs. Im sure there are more technical ways to explain this but this is in my own words....
im not sure but i think the Maxima stock already is a 3 angle valve job.
-Mike
#21
#22
I think Im going to do it myself since I have all the tools needed Ive already done a set on my VW and it made a big difference till the waterpump took a **** and cracked the head due to overheating. I have 2 sets of heads to play with so screw it.
#23
Originally posted by TILLEYS99
I think Im going to do it myself since I have all the tools needed Ive already done a set on my VW and it made a big difference till the waterpump took a **** and cracked the head due to overheating. I have 2 sets of heads to play with so screw it.
I think Im going to do it myself since I have all the tools needed Ive already done a set on my VW and it made a big difference till the waterpump took a **** and cracked the head due to overheating. I have 2 sets of heads to play with so screw it.
The key with out a flow bench is to only do minor shaping. Cause if you hog it out too much you will loose some usable power.
Thread
Thread Starter
Forum
Replies
Last Post
CAN-Toronto FS: Basement cleaning
knight_yyz
5th Generation Classifieds (2000-2003)
12
11-01-2015 01:34 PM
worldwiderecognized
6th Generation Maxima (2004-2008)
0
09-30-2015 01:16 PM