Mag vs standard SOHC head

rice_eater · Post by **rice_eater** » Thu Nov 10, 2005 10:20 pm

baal, post a pic of the inside of the port if you can...otherwise, turn your brightnesses way up and look at teh huge humps right at teh mouth of the ports in the non-mag, and then look at the magnum... you'll be porting your hands off

Baal · Post by **Baal** » Thu Nov 10, 2005 10:21 pm

05srt4clone wrote:Hey Baal, what tweaks are you referring to?

Well the magnum has so much improvement over the stock sohc, the variable intake manifold, the huge exhaust ports & exhaust, and the cam.

That 16 extra HPs makes no sense, so something is wrong IMO about the magnum setting, i think its a poorly designed cam that isnt taking advantage of the variable intanke and the exhaust ports.

something is just wrong about it, i dont think i have the knowledge to say if its the comp ratio or the lift, duration, overlap or something, but 16 extra hps is silly.

PS: its not my pic rice eater, i saw it a while ago on the other crappy org and i found the difference amazing so i saved the pic in my Hard drive.

rice_eater · Post by **rice_eater** » Thu Nov 10, 2005 10:26 pm

Loud-e-nuf wrote: I thought the Mag Head had the lump in the exhaust port casting removed.

did you click the pic to zoom in?? you cant even see inside the non-mag head due to the hump, but the magnum you can see right through...

Loud-e-nuf · Post by **Loud-e-nuf** » Thu Nov 10, 2005 10:38 pm

If you PM me your e-mail I'll send you the pics of what I did on one port in an hour, I need to take more pics since I've since done some of the finishing work. But the head is aluminum which is easy to work with, the port matching to the mag gasket only took 1.5 hrs for the exhaust side, but then I started on the casting lump.
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rice_eater · Post by **rice_eater** » Thu Nov 10, 2005 11:11 pm

same as the email in my profile, georged_83@hotmail.com i'll host them for everyone to see

CrashTeam · Post by **CrashTeam** » Fri Nov 11, 2005 10:43 am

Ya Baal thats my same point, somthing just doesnt add up with the hp numbers..

rice_eater · Post by **rice_eater** » Fri Nov 11, 2005 11:55 am

from fred, i will resize them later.... fred, overall not bad, but obviously a lot more work is needed for it to be smooth inside... focus also on the little divider wall in between the valves; on the magnum that area is a lot thinner

Loud-e-nuf · Post by **Loud-e-nuf** » Fri Nov 11, 2005 12:59 pm

Thanks! I've been questioning how far to go on the divider wall as I think it helps build a little velocity for the exhaut gasses as the escape the chamber. The hardest part is where the valve guides meet the head trying to make thatsmooth requires removal of a lot of material. But do you think it'll flow close enough to a mag head?
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rice_eater · Post by **rice_eater** » Fri Nov 11, 2005 1:45 pm

i think the biggest thing is that you're gonna have uneven flow between the ports, since there is no way in hell now you can balance those ports now without a flowbench or whatever it's called

Baal · Post by **Baal** » Fri Nov 11, 2005 3:02 pm

remember the divider wall should be sharp as a knife

Loud-e-nuf · Post by **Loud-e-nuf** » Fri Nov 11, 2005 6:01 pm

I can understand the reasoning for that on the intake side but does it matter as much on the exhaust?
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Baal · Post by **Baal** » Fri Nov 11, 2005 7:03 pm

Loud-e-nuf wrote:I can understand the reasoning for that on the intake side but does it matter as much on the exhaust?

not as much, but if its not a sharp edge it creates vaccum and unnecesary turbulence, it might not be very important but if he is doing the job well, he should go all the way.

Datoyminaytah · Post by **Datoyminaytah** » Sun Nov 13, 2005 12:32 pm

As far as exhaust, yes, base-level and R/T Neons (2nd gen of course) both have 2.25" exhaust from the cat back to the muffler, that's where it's different.

R/T midpipe goes straight into a 2.25" muffler pipe.

Base-level Neons have the end of the midpipe reduced to 2" to fit into the 2" muffler pipe.

As far as horsepower, remember the base models make 132hp @ 5600, and the R/T makes 150hp @ 6500. Which means the Magnum engine system as a whole flows much better above 5600 RPM where the base model starts starving for air.

rice_eater · Post by **rice_eater** » Sun Nov 13, 2005 8:10 pm

^^^ are you saying the slight bottleneck makes up for a big difference?

remember how you need a long tube to get 170ish hp, maybe that's been the thing about our cars all along, the exhaust side? so get a cam that takes advantage of that and you're good right?

MyNeonSaysHi · Post by **MyNeonSaysHi** » Mon Nov 14, 2005 12:19 am

Anyway it's quite a shopping list and I'm sure I left several things out. Paul.

Its Raul...lol

J-Villa · Post by **J-Villa** » Mon Nov 14, 2005 12:22 am

man i need to invest in a magnum head lol

tamadrumr88 · Post by **tamadrumr88** » Mon Nov 14, 2005 6:41 am

hey, can you measure the I.D. of the stock magnum exhaust ports?? are they 1 5/8" or 1 7/8"

thanks!

Datoyminaytah · Post by **Datoyminaytah** » Mon Nov 14, 2005 9:10 am

rice_eater wrote:^^^ are you saying the slight bottleneck makes up for a big difference?

No, I was just pointing out the difference between the base-level and R/T exhaust because it was being discussed earlier.

nght18 · Post by **nght18** » Thu Dec 15, 2005 12:02 am

hey whats up....I would like to know if i get a bare mag head would i be able to put in all my reg sohc valve train? would that make any sense?...Cuz i know about the mag head flow betta than a fully ported soch head. But just wont have the hotter cam. Lata down the road i will get a crane cam and springs. I'm planning on boosting the motor. So fully built block , mag head with reg sohc valve, springs,cam, and retainers. Am i going the wrong way about this? any help would be good thankx

rice_eater · Post by **rice_eater** » Thu Dec 15, 2005 12:29 am

yeah, the rocker arms and everything are the same. the magnum springs are stronger, and the valves will have 3 grooves instead of 1, but otherwise there's no difference

nght18 · Post by **nght18** » Thu Dec 15, 2005 12:27 pm

hey rice eater..when u said other wise there's no difference...i will have the killa flow of the mag head with my SOHC parts right?

nodestiny · Post by **nodestiny** » Thu Dec 15, 2005 1:47 pm

Hey,

Anybody know the MAXIMUM CFM of the mag head (even maybel P+P)?

rice_eater · Post by **rice_eater** » Thu Dec 15, 2005 6:51 pm

nght18 wrote:hey rice eater..when u said other wise there's no difference...i will have the killa flow of the mag head with my SOHC parts right?

you will have the same flow if you also add the magnum cam coz it has slightly higher lift, but otherwise the rest of the valvetrain wont make a difference

nght18 · Post by **nght18** » Thu Dec 15, 2005 11:16 pm

i dont really care about the mag cam...all i want is betta flow (=more power) when i go boost. I'll worry about rebuilding my head lata with crane cam (not sure if i 'm going with # 12, o4 14) and crane srpings, retainers and probably some light weight valves. If i cant find a mag head i'll just say screw it and buy a new bare head. lata

rice_eater · Post by **rice_eater** » Fri Dec 16, 2005 3:43 am

you can use the magnum springs if you stay with a #12 cam or magnum cam (#12 is good for turbo, dont bother with 14), rather than buying expensive crane ones.

phenomeneon21 · Post by **phenomeneon21** » Fri Dec 16, 2005 8:04 pm

by adding a crane cam #12 to a magnum engine and doing some fine tuning, would it be possible to get some extra horses out of the engine that way? or is the magnum cam perfectly suited for the magnum engine?