Ported cylinder or Serval

[moparmadman40]

so i just tore the engine down that i will be using for a snowbike/banshee build, turns out that the "fresh" bore and pistons were done crap and one pison and jug is scored. So.... i will likely be using a custom 2-1 pipe, lets not debate that too much, i will be replacing the crank so probably go a 4 mil, and the reason i used a banshee engine is because i may turbo it in the future and did not want to turbo a single cylinder bike engine. What are the opinions on three different setups, cleaned up and re-bored the allready bored stockers OR send them away for a port job OR buck up and put a set of serval cylinders on it? the obvious differences in price will have to be made up somewhere else likely me not having it done and riding this winter

 

what would the differences in power output be between these different options? and if i do turbo it later would the extra money now be wasted?

[lms1977]

Stay all stock.. its cheaper when you blow it up especially if your gonna try to turbo it on your own

[chevota84]

If you're planning on boosting it later, you're not going to want to screw with port timing much. To do a 4 mil stock cylinder right won't be much less than serval cylinders, with that being said, a boosted 4 mil serval would be wicked. I think matt shearers turbo 7mm serval is in the 170 range turned down.

 

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[chevota84]

when did mat get a turbo serval? i know his buddy tom had a turbo 421 cub making 200hp (mat built it)

 

 

and a 4mil stock cylinder is cheaper than a serval.

It might be his buddies, Matt's name was just attached to it. I'm fairly certain it was a serval though.

 

I guess I've thrown so much money at mine that another 3-400$ for a serval over a stock cylinder doesn't seem like much.

 

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[joey83]

I did a ported 4 mil stock cylinder and kind of wish I went serval. But the money thing got me too. Do you know what size your jugs are at right now? If you throw another $200+ at buying some virgin cylinders to port than I would just pony up the other $500 for a serval if I had it. Then sell your cylinders and head for $100 on Ebay. Now you're at $400 difference. But you also picked up the $200 head with FAST serval kit. So really only a $200 difference. BUT if you have a failure the serval is more expensive to rebuild.

 

What other mods are on your bike?

[moparmadman40]

as of now there are no mods, i was planning on using the stock cylinders because they were just bored and new pistons. But because the job was done poorly i now have another decision to make. I haven't measured the cylinders yet but i think it might only be the first oversize. I guess another question is what a cleaned up serval 4 mil with a 2 into 1 pipe would make for power? if it makes enough i might just not need a turbo for a while. gotta remember its going into a 300 pound bike.

[Dixie normus]

Why not call and talk to shearer himself? If you are going to do it why not use the "man" himself? He can sell you what you really need

[chevota84]

a 421 serval cost like 1500+ new

on FAST site it is 1723 for everything

"We also have our Complete kit (421cc) that comes with: 421cc 4mm Serval cyl., Pistons, Stud extenders, Water plugs, base gskt, 2x ARP Cub base nuts, F.A.S.T. Head and domes (set up for your altitude/fuel), "Hot Rods" 4mm crank Trued/welded, Ready to bolt together! $1,723.00"

 

 

http://farmandsandtoys.com/partdetail.asp?partid=403

 

same site

for a ported 4mil

$450 for crank

$255 for head

$350 for porting

$1055 for a ported 4mil stock cylinder engine.

 

that is a lot less than a 421 serval.

You going to run your stock cylinder with an open bore? Another $200 for pistons/gaskets. If you could get $100 out of your stock cylinders the difference is only $350=not much in my book.

 

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[RagunCajun]

I had a 4mil ported stock job set up for a few years. Bike blew up earlier this year finally. Going with a serval cub with port work. I want to make more power on pump gas. Yes it's expensive.

[moparmadman40]

another consideration i just thought of is the size of the cylinders and head, since this engine will not be going into a banshee (dirtbike frame) i do have some tighter clearances to think of. Can anyone comment on if there is a different height of the cylinders or height of the cylinder head required for them?

 

[Larry's Shee]

Holy crazy shit Batman

[Wildcardracing]

I think you're going to end up having to have a pipe builder do a custom pipe for your application. Off the shelf banshee pipes won't fit well, unless you have the ability to fit it yourself

[Deadbeat]

wow that is a thing lol, is the steering going to work on that?

[coryv4]

if you are going to turbo id deff go with the serval. the low end porting will help it spool off the line as opposed to a high horse power stock cylinder.

[coryv4]

oh i didnt realize you are doing a sled build. you could do a 4mil stock cylinder. with all that rotating mass it will have more than enough load to spin the turbo up.