lazy engine (b200e) why??

[racing-street]

I have got a question, why is so lazy the b200e engine, my engine is in perfect codition, i open it to clean and change some things but is lazy reving.
what i don,t understand is why, becouse the cilinder head ports are really good for a stock engine, are straight and the combustion chamber is not the best one but is not bad, the inlet manifold don,t seem very restrictive, and the exhaust looks more or less good for mid range (4-2-1) them i supouse that the "problem" is in the bottom end, but it have got 89,6mm bore and 80mm stroke then i would be a fast engine, the bottom end is the only thing i haven,t opened.
somebody can tell me the answer? may be the piston rings or really really strongs?

[jtbo]

Cam and thing that is called piston guiding which is new feature introduced by low friction B200 engines are those reasons why it takes rpm slowly, also you should note that when revving there is one shaft running at engine speed that goes from clutch to gearbox that is at rear axle.

However swapping cam and getting good engine management and it should be closer to modern cars, but with faster decreasing rpms and more direct throttle response.

[xtrmjks]

Cam and thing that is called piston guiding which is new feature introduced by low friction B200 engines are those reasons why it takes rpm slowly, also you should note that when revving there is one shaft running at engine speed that goes from clutch to gearbox that is at rear axle.

However swapping cam and getting good engine management and it should be closer to modern cars, but with faster decreasing rpms and more direct throttle response.

Like the man said, cam (std) is strickting engine from reving up..
You only need to swap cam (maybe go twin carbs..) and it will rev like a bike!!

[pettaw]

All the Volvo redblocks have this problem, and it was compounded in later years due to trying to make them smoother. The B200e has an extremely heavy flywheel and heavy harmonic balancer at the front which also doubles as the crankshaft pulley so will be reluctant to rev even though it provides more bhp and torque than the lighter B19 which doesn't have the damper at the front. The standard cam in the 360 injection versions is the A cam which is already pretty hot for a road car. If you measure the vacuum at idle its approximately 15 inches which is hot for a road car, compared to the more usual 22ish inches for standard setups.

If the car feels slower than it should, its probably because the LE-jet fuel system is not functioning properly. My car felt lots faster when I upgraded the management system, even though I was only making exactly standard power, according to the specs, showing how much the original system had deteriorated over time. Changing fuel systems is not without its problems though, and going to fully programmable will probably mean you spend more time tuning your car than driving it, certainly for the first few months

[jtbo]

Pettaw, he can always ask your excellent settings file to get month off from tuning time?

[Ste00]

out of curiosity what fuel are you putting in her? mine always feels lazy when its on 95ron put some vpower in her and she is a different car.

[racing-street]

ok them the problems are:
-flywheel too heavy
-harmonic balance heavy
-A cam bad for sport use
-LE-jet fuel sistem is too old
-piston guides

solutions:
i,m going to fit carbs (webber 45)for a b230
light weigth flywhell (I supouse that in the b230 is the same heavy flywheel)
other cam, which one???
pistons are going to be modified whit all the bottom end (on a b230 engine)


which other cam i can fit? or in what other engine i can find that other cam? tell me if you know the engine code or the type of volvo.
the evolution is going to be a b230 carbs but know i want to make a bit quicker the b200e, them the faster solution is the cam.

thanks all of you!

[xtrmjks]

Rods and pistons (13mm rods and higher compression!!) from 16v..
There is LOADS of cams available from Sweden..
PM Me!!
45's work well!

[jtbo]

I believe that 79-83 240 GLT with B23E had cam of choice (first H-cam and then from 1981 K-Cam).
So older sportier Volvos, with first redblocks had such cams. Only K and H are those which I would consider or then aftermarket sport/race cam, it is just that H-cam can be pricey and you can get proper race cams from Sweden within reasonable price range.

It is so huge difference with K-cam, engine actually comes alive and when you hit 2500rpm it starts really to pull and redline of 6200rpm just comes too early as engine pulls cleanly to redline.

Don't know if one can get to work how well at low rpm with carbs as there is quite lot of overlap, but with injection system it was possible so that car had more torque from idle than with stock cam and carb, but maybe with good tuning of carbs it works well with part throttle and low rpm too.

A cam is ok for road use and it is not hopeless, but it still is causing engine to slow down at higher rpm, when with k-cam it never slows down until limiter comes, at least this is my experience with these in B200 engine.

Oh yes, you are limited with exhaust valves in B230, those are tiny so they can restrict air flow a bit, design is partly because of emissions, If you check all Volvo heads have tiny exhaust valves and it is only so much hot gas that can go trough those, it is place I'm going to pay attention to at some point.

Have you got previous experience from carbs?

[racing-street]

yes i have got some experience in carbs, and thanks all of you for this information, becouse here is really dificult find info of volvos in spanish and is inposible see a volvo tuned (less good tuned) but i want to make a cheap old school as my studys project, but properly done, first in making money, and when i had the b230 i will put some photos of the updates, in a month i probably had it, but i,m going to spend much more time to finish it becouse of the money.
thanks!!

[jtbo]

Sounds nice indeed and your experience with carbs will help a lot

I know only injection systems, I know how carbs should work but it seems that they don't never listen to me so they don't work with my cars

K-cam is cheaper to source, costs around ~100 euros. A-cam (which you have in your engine) perhaps 20-40 euros, but these are prices here in Finland, in Sweden lot cheaper, in Spain probably very hard to come by?

Ebay is one good source, xrtmjks did just build carbed motor with race cam that he got very cheap, so I recommend that you sen message to him about that

Looking forward to hear from your progress, it never ever can be as slow as mine, I'm the slowest

[racing-street]

the carbs are not so difficult you only need to spend a bit of time, looking the sparks, listenig the carbs and engine and living all the throtles perfect, apart from choose the correct jets.
finaly the sound is loving.
yes here in spain find something for these car is more than inposible an i don,t know anything of sweddish or finnish but i,m going to ask to my girlfriend, (is living in sweden)
i send a pm to xrtmjks and i,m going to look in ebay
thanks for all!!!