9 replies to this topic

[booton]

ok putting my new engine together and the last thing is the timing i need to sort out.

ok here the link for the camsfahft
http://www.pipercams...p?pid=MINIBP270

it doesn't have an ofset which i'm suprised at.

so i'm guessing the timing it just dot to dot getting the does perfectly lined up.

would any one fitted one of these or simular, did any one of set it

[Pigeonto]

ok putting my new engine together and the last thing is the timing i need to sort out.

ok here the link for the camsfahft
http://www.pipercams...p?pid=MINIBP270

it doesn't have an ofset which i'm suprised at.

so i'm guessing the timing it just dot to dot getting the does perfectly lined up.

would any one fitted one of these or simular, did any one of set it

Isnt that link for BMW mini 270 cam? I have just built my engine with a 270 which needs 107 deg full inlet lift after top dead centre.Dot to dot mine was 108.5 so I used a 2deg offset key to bring it to 106.5deg

Edited by PIGEONTO, 05 October 2010 - 05:10 PM.

[booton]

your right sorry lol it s this one
http://www.pipercams...p...4&engine=62
the bp 270

[Pigeonto]

your right sorry lol it s this one
http://www.pipercams...p...4&engine=62
the bp 270

yup, realised that.Been to their site dozens of times whilst deciding on cam to use!! As above,mine was 1.5 deg out using dot to dot but I wouldnt have thought you can take any notice of my situation,they probably vary. To be correct you'd have to put it all together with a straight key then go through the rigmarole of checking it,ordering the necessary key,waiting 2 days for it, putting it together and then rag it about!!

[booton]

because i have a adjustble timing chain i can use a straight key and adjust it using the adjustable part of camshaft sprocket

gues i just have to put it dot to dot and they see whats what if the valves not opening in the right place then i can adjust it a

[Pigeonto]

because i have a adjustble timing chain i can use a straight key and adjust it using the adjustable part of camshaft sprocket

gues i just have to put it dot to dot and they see whats what if the valves not opening in the right place then i can adjust it a

Ah,didnt read your post properly.Precisely what you have to do,but you dont have to start dot to dot,just put it together and checkit then adjust accordingly.I believe a pint at the next mini show is the normal wager on here,so a pint says you'll turn it the wrong way first time you go to alter it....EDIT***That could be read wrong,I meant you dont need to be EXACTLY dot to dot but you obviously must be on the right tooth and may be 1/8th inch to left or right of dot to dot to start with.

Edited by PIGEONTO, 05 October 2010 - 05:54 PM.

[samsfern]

i normally start at dot to dot, which is normally miles out, then go from there, i do hope your doing it properly with a dial gauge, etc, to establish true tdc and true full valve lift.

When i fitted a 649+ cam to my new 1330, i spent over 2 hours timing it in, managed to get it absolutely spot on. I dont do half measures, lo

Edited by samsfern, 05 October 2010 - 05:59 PM.

[booton]

i heard that even though it dot to dot the camshaft could be out.

so will have to have a good look at it joy lol

nevermind any tips would be good.

[Pigeonto]

i heard that even though it dot to dot the camshaft could be out.

so will have to have a good look at it joy lol

nevermind any tips would be good.

Theres probably lots of tips people can think of.Ones that spring to mind,remember there is quite a dwell on crank and cam when they are at top so make sure you do get the exact midway position between just having hit top and just beginning to go down in the case of both the piston and the cam,dont take it that top is immediately where it stops moving.Also if you turn backwards to double check something,go enough,say 30 degrees, to take up slack in chain.Have you knocked out that indent in timing cover enough to miss chain.Check that the screws around the timing cover havent been tightened so much that they have pushed the metal under them inwards leaving it "high" there.I always flatten them back with the ball end of a ball pein hammer to prevent oil leaks.

Edited by PIGEONTO, 05 October 2010 - 06:46 PM.

[samsfern]

as i said, dot to dot is normally miles out.

True tdc or true valve lift is in the middle of the dwell period, so say your timing disc shows 100 degree when the piston is at its highest point on the dial gauge, and reaches 113 degree before it starts dropping, true top dead is 106.5, so turn the crank back 20 or so degree, then turn it to 106.5 degree on the disc, your now at true tdc, so line the pointer up with the tdc mark on the disc, simples.

Im not very good at explaining things so im not going to bother going into too much detail.