5 cylinder engine

darth sidious

darth sidious

New Member
j_radcliffe said:
A 67 would have HD8 carbs. You can identify the carbs as HD 8s by the number on the tag, on the float chamber. The number will be AUD92. I do not think that any of the HD8's had crank case gas recirculation. What you need is a breather tube, which then attaches to a 10 inch pipe that vents the gases over board.

I have found a photo off the internet, my car is in winter storage right now, so I cannot take a photo. The photo is of one of the experimental Rover 5 cylinder motors. It shows the vent pipe for the gases to go overboard. The crankcase breather pipe.

http://www.google.com/imgres?imgurl=htt ... 80&bih=636


James.
Click to expand...


I know this is the 4-pot section, but seeing the 5-pot was (5/4)ths the 4-pot...

Does anybody know how the crank journals (I think that's the right term for where the piston connects to the crank!) are positioned with respect to each other on a 5-pot car? On a 4-pot, 1 and 4 (the outers) are 'level' to each other, 2 and 3 (the inners) also 'level' to each other, but 180 deg opposite to 1 and 4 (i.e. At TDC, 1 and 4 are 'up', 2 and 3 are both 'down')

Nobody I have asked before seems to know for certain!
 
KiwiRover said:
They are all evenly spaced. No pairs. I found this...http://www.autozine.org/technical_schoo ... mooth2.htm
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Thanks! That's quite a read! One thing I'm wondering is this line

Since the 80s, car engineers regard 4-pot engines larger than 2 litres in capacity had better to be equipped with twin-balancer shafts to dampen the vibration. Although the strengthening of engine block, the use of hydraulic engine mount and lightweight pistons helped breaking such rule, the trend of pursuing refinement once again led to many engines larger than 2 litres to use balancer shafts.
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Does the P6 2200 engine have [a] balancer shaft(s)? The 2200 is, obviously, larger than 2 litres.
 
No it doesn't and I can think of quite a large number of 2 litre plus engines without balance shafts. (in fact I can't think of many with them) so I'm not sure where they get their info from.
 
Balance shafts in straight fours is something more recent than the early 80's. NVH levels that in the past were thought to be acceptable are not any more, hence the introduction of balance shafts. It's not that you cannot built 4 cyl engines with a larger displacement than 2 litres, you can, but they are not going to be smooth.
The Rover 2.2 has the advantage of being oversquare and relying on soft mountings (that eventually sag and don't help much, but that's another story) so it's not too bad.
The Land - Rover 2 1/4 is also a big four, but you wouldn't describe it as a smooth engine, even with the standards of its era.
 
Don't think I've ever seen an engine with a balancing shaft. I'm sure (but stand to be corrected) the BMW E30 M3 engines didn't have them and they were 2.4 four pots......
 
hi richard uk,
bmw four pots only ever went upto 1.8 litre, 2.0 and 2.5 litre engines were always six cylinder engines. nineties saw a 2.0 litre 4 cylinder engine

ian
 
richarduk said:
Don't think I've ever seen an engine with a balancing shaft. I'm sure (but stand to be corrected) the BMW E30 M3 engines didn't have them and they were 2.4 four pots......
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They did a 2.5 Sport Evo too which was a four pot. Citroen DS had 2.3 fours with no shaft either IIRC :D
 
josephp6man said:
hi richard uk,
bmw four pots only ever went upto 1.8 litre, 2.0 and 2.5 litre engines were always six cylinder engines. nineties saw a 2.0 litre 4 cylinder engine

ian
Click to expand...
Sorry, but ya talking to a BMW engine fan. ;) For the road cars yes the 2.0 and up were six pots. But for the E30 M3 car they used a special built engine (S14) going all the way up to 2.5 in the EVO car.


http://paultan.org/2007/07/16/the-histo ... m3-e30-m3/
History_M3_E30_14.jpg
 
Demetris said:
GrimV8 said:
Citroen DS had 2.3 fours with no shaft either IIRC :D
Click to expand...

Yes, but all DS engines were notorius for NVH, even by 1960's standards.
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I'm not really into them but work on lots of them. They seem lovely and smooth, especially the EFI models, as long as you can't see the engine :wink:
 
GrimV8 said:
Demetris said:
GrimV8 said:
Citroen DS had 2.3 fours with no shaft either IIRC :D
Click to expand...

Yes, but all DS engines were notorius for NVH, even by 1960's standards.
Click to expand...
I'm not really into them but work on lots of them. They seem lovely and smooth, especially the EFI models, as long as you can't see the engine :wink:
Click to expand...

Then perhaps i have just sampled bad ones? I cannot recall exact specification, certainly not the late injection cars. Lovely smooth ride, razor sharp steering, but the engine was a disapointment. A friend commented that it was like someone has transplanted the engine of his 4L into the DS. Certainly my TC feels waaay smoother, at least up to 3000 - 3500 rpm.
 
Citroen DS engine is based on the Light 15 engine and reckoned to be the least technically advanced part of a DS/ID - and i'm a Citroen fan , Citroen CX's had a 2.4 4cyl OHV without a balance shaft

Didn't Porsche do a 2.7 4cyl engine for the 944 ?
 
My old 2L V4 Transit had a balance shaft - only engine I have ever worked on that had one.

Richard
 
The Ford V4 had a balance shaft because it was a 60 degree V. The V6
didn't need one although it had a different flywheel with cast in weights
and an asymmetric bolt pattern. Colin
 
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