http://cgi.ebay.ca/Volvo-Header-242-GT- ... dZViewItem

a header fora B21F??? is there really any point?

Ian, Dale, Matt, or Athal...got some insight into this? teach me

ciao

Why do you think there's no point to a header on a B21?

Verr nace...

I'm not sure what you're askin Vik?

Thats probably a nice 5-7 hp across the board right there ...


I'd actually ask what the point of a header is on a turbo car ... Yes, I know, better spool, less back pressure - etc - but ... well, the reasons seem more pertinent on an N/A motor

well for a motor like your's/Ian's...i could see it...because they already make a lot of power

but the B21F makes like what, 100hp at the crank? how much could you get out of a B21F with say and intake/exhaust/header/camshaft....like 110hp??? doesn't seem worth it to me

that's what i am asking...is it really worth the money

ciao

Realistically, the power potential is limited by head flow, but look at the ITB cars to see what a "stock" NA OHC Volvo engine can make. To do that you need all your tricks.

Still, there's a reason why the headers are $600 USD. They're not terribly popular, the OEM exhaust manifold/downpipe is quite good, and you're not talking about too much of a power increase.

You're not going to gain 50 hp from adding a header alone, but adding a header will allow you to take full advantage of a set of Weber/Mikuni carbs and a big cam.

You didn't originally ask if they were worth the money, you asked if there was a point.

no that's not what i asked but it's what i meant, can't you read my mind yet?



another question, has anyone out there built up a B21F a considerable amount to make you say "wow, that's cool" and produce some good numbers?

ciao

any engine can make some fun numbers with headwork, compression, full on balanced bottom end, lots of revs, and fancy intake/exhaust

- R

I megasquirted my B21F, and it picked right up over the K-jet. Had a K cam in it (not sure that's the best choice) and a 2.5" exhaust, and it would run those B230F 17#/hr injectors to 100% duty (supposedly good for 125 hp) and I ended up installing B230FT injectors and was tuning them in before I spun a rod bearing.

No question in my mind that a B21F can make decent power - say, over 140 with just bolt-ons. Of course, a B23E longblock would swap right in, get you 10% more displacement and higher compression, plus better head flow, and theoretically starts out at 140 hp. Add MS, a good cam and a decent exhaust, and I bet 160-170 is within reach without head mods. Big valves, porting, and a little more compression and 180-190 is within reason, provided you can keep it spinning above 7000. Full race (8000+, fully built, 12:1 compression, huge cam, well developed head) and you'd get over 200 I'm certain.

You not happy that a certain 122 was pulling away from you last night?

hahaha that's rich!

no that's not the problem, i was just curious...next year after the 760 is running i plan to give the GT an overhaul of suspension and front end/brake work

i was just thinking if it's worth it to tune a B21F or just leave it alone for a bit and have a solid lil beater motor

ciao

What Matt was describing above was at one time my goal for my wagon. I really enjoyed my b21f with k-cam and 2 1/4" exhaust. It was good to a point, and pulled not too bad considering how it was stock. But to think about a properly built b23e is pretty exciting. Funny thing is, while I've seen/heard about a lot of worked b20's, I haven't heard about a lot of done up b23e's. They would truely haul, and make a lot of nice noise. I even remember someone in Sweden selling a different computer for it....it just said "160hp." Not sure how that would happen, but interesting.

I eventually opted out of such a build simply because of the investment....a lota money considering how cheap the turbo swap was....

Vik, I'd change the cam and exhaust, and be done with it. There's not much to "tune" unless you tear it apart and go to a standalone. Considering you already have a project car, I'm guessing you'd be satisfied with a few bolt-ons?

i already have done up an exhaust, put in that K&N drop in filter, drilled out a lot of the airbox, (it's basically a frame to hold the airfilter now ) and thte next thing i was thinking of doing was the K cam, speaking with Athal one night here...other than that i don't plan to do much more to it cept for some springs/shocks/brakes...you know...so it can handle how i drive it

ciao

Sounds good! Glad that K&N worked for 'ya!