|
Post by indianajones on Sept 29, 2012 4:48:46 GMT
Thought a kick this off with a new thread. Picked up the engine from my mechanic this morning. Has no head, no front cover and head bolts from first looks, but has the the important bits being the block and the gear box ;D My mechanic also gave me a cam out of RWD B series engine (not sure if an MGB or Marina). I doubt there'll be any work done this side of Christmas, but afterwards might pull it out and go from there. And of course, here are the pics: -Andrew
|
|
|
Post by dave1800 on Sept 29, 2012 6:29:35 GMT
Very useful! The MGB had an electric fuel pump as far as I recall the marina a mechanical one. So if the cam has the lobe for the fuel pump it's most probably from a Marina I believe.
Regards
David
|
|
|
Post by indianajones on Sept 29, 2012 6:35:25 GMT
|
|
|
Post by tommydp on Sept 29, 2012 7:53:18 GMT
Great! Spare engines are useful! I have 5, planning to rebuild one myself to keep as a spare for the future. I'm getting another engine too, as I've spoken to an elderly gentleman who has a mk 1 engine in his garage with a Leyland Special Tuning head fitted on a trip to England in the 70s.
Your engine is from a Princess 1800, note the clever engine mounting arrangements.
The new pistons in the picture look as if they are supposed to have 4 rings, as on the Landcrab/ MGB etc while the Princess and Marina pistons have 3. I'm not sure if the pistons are interchangeable, do anyone know?
Agree with Dave, if there is a lobe on the camshaft, close to the timing chain side it's for a Marina. You will still need an electrical pump, as obviously the Marina has the petrol pump at the opposite end of the engine compared to 1800/ Princess. It has the same valve timing as the crab and Princess. Believe me, I know a thing or two about camshafts now..... :-)
Looking forward to updates on this. Would be great if we could have an engine rebuild thread! I'll join when I start rebuilding one of mine:-)
Regards, Tommy
|
|
|
Post by indianajones on Sept 29, 2012 8:36:01 GMT
Thanks for the info Tommy, A Princess engine would of been my last guess, will need to look at the engine in my Wolseley to compare.
Would it still be mountable with the current arrangement in the crab?
-Andrew
|
|
|
Post by tommydp on Sept 29, 2012 9:03:41 GMT
It will fit, don't worry:-) I have a Princess engine too in my blue one. The blocks are identical. As mentined before, I'm pretty sure you already have a Princess engine in your Wolseley:-)
You will have to change the front plate, the one behind the timing gears, to get the correct angle for the front engine mounting.
Tommy
|
|
|
Post by dave1800 on Sept 29, 2012 10:29:05 GMT
Hi Tommy, I see the mention of camshafts brought you back to the forum I believe the 4 ring pistons were for MK1 cars only in the UK. Later models used 3 rings and I believe the pistons were lighter. They used different con rods - floating gudgeon pin on the "little end" bearing MK1 and solid on the Mk11/111. regards David The new pistons in the picture look as if they are supposed to have 4 rings, as on the Landcrab/ MGB etc while the Princess and Marina pistons have 3. I'm not sure if the pistons are interchangeable, do anyone know? Regards, Tommy
|
|
|
Post by indianajones on Sept 29, 2012 10:52:12 GMT
Hmmmm this will need to looked into further it seems, as they're a very cheap price.
Can't see anything in my manuals refering to 5 rings, which cars made use of of them? (Unless the seller has got it wrong.)
But Earlpart has 5 ring pistons listed in their catalogue for all Mk's
Could they be used instead of 3/4 ring pistons?
-Andrew
|
|
|
Post by Penguin45 on Sept 30, 2012 21:43:31 GMT
Not what you want, Indy. See list HERE. Chris.
|
|
|
Post by Penguin45 on Sept 30, 2012 21:50:43 GMT
In fact, HC pistons post 1970 are p/no 12H5163H for the BL item. Press fit gudgeon (small end) pin. You should be able to source through MGB specialists.
I wouldn't buy anything until you've investigated the engine thoroughly. It's all still out there and fairly easy to find.
Chris.
|
|
|
Post by indianajones on Sept 30, 2012 23:02:04 GMT
cheers Chris,
I won't be getting those pistons as they're standard compression for the 1800 and of course you're dead right, take it apart first and see what I have got before I start buying things I will end up not needing.
I have a local MG specialist and with various UK suppliers (like Earlpart etc) and the of course the LOCI (do they stock much engine stuff?) I'll be pretty sweet.
So for a later B engine/Princess one I'm looking at 9:1 compression ratio? (aslo another newbie question, how exactly is the ratio figured out? pressure vs volume?)
-Andrew
|
|
|
Post by indianajones on Nov 5, 2012 6:50:43 GMT
Was just thinking about carbs, the S type had Twin HS6's correct? don't MGB's have HS4 (or HIF4 on later models)?
Why not the same size if for the same engine etc?
-Andrew
|
|
|
Post by dave1800 on Nov 5, 2012 7:28:34 GMT
The "S" had a higher compression and more power than the B! Was just thinking about carbs, the S type had Twin HS6's correct? don't MGB's have HS4 (or HIF4 on later models)? Why not the same size if for the same engine etc? -Andrew
|
|
|
Post by indianajones on Nov 5, 2012 8:24:08 GMT
I need to read my old threads more often lol! I was suggesting balancing over and above the "normal" rebuild I believe the MGB inlet manifold will work, maybe someone can confirm? Yes the S used HS6 (1.75" throat), the MGB HS4 (1.5" throat). If you used a CR less than the S type which I think would be sensible then 2x1.5" HS4 carbs would be better and possibly easier to source for most of us, but you have an excellent offer in NZ of HS6s. HS8s would screw up the low down power too much. Extract from Wiki To determine the throat size from the serial number: If the final number (after one, two or three letters, beginning with H) has 1 digit, multiply this number by 1/8", then add 1". For example, if the serial number is HS6, the final number is 6: 6/8 = 3/4", add 1, total is 1-3/4", etc. Regards David -Andrew
|
|
|
Post by dave1800 on Nov 5, 2012 9:25:50 GMT
Posts do go awol sometimes especially as you get older There is no simple answer. It depends on how far you want to tune the engine, ie camshaft, manifolds head mods etc. Also how you will be driving the car, lots of high speed or not - and the cost of the conversion and the fuel. (Remember also the "S" has bigger disks and a more powerful calipers which woild be a good idea.) The twin carbs may have a slight edge fuel wise above 4000rpm but the single HS6 is far more economical in town and speeds up to around 65mph -BMCs own figures showed around between 25%-40% (wait for howls of disagreement!) I thought you had an offer to 2xHS6 carbs which I would have snapped up. As a generalisation the HIFs are better but more complicated and the smaller HS4s would give more bottom end than twin HS6s all other things being equal. With today's fuel if you want to go the twin carb route I would stick with the standard MK11 cam - not the MGB version plus twin HS6s and an S exhaust manifold as a good compromise. I think that is what Chris runs but I could be mistaken about the cam (I also think he has HIF44s which are the same size as the HS6). Alexander may encourage you to go to the "S" spec but I think you need to think first about what you want and then research the best carb set up. Regards David Wait where did my post go? lol I made one saying what you be the best options for a TC set up, HIF4's? HS4's? HS6's? -Andrew
|
|