Quick Question thread

[dave]

miscellaneous guides (2 viewing)
does this count as anything such as.
Changing a light bulb?

no is for things that can be for any car

 

[Focus Owner]

aw perhaps there should be a non car one

 

[jug]

Whats an easy way to calculate the change in compression ratio when adding a decomp plate? we are talking 16v, not 8v.

you need to know-
current compression ratio
current cylinder volume
diameter of cylinder
thickness of decomp plate

lets use an imaginary example

current compression ratio is 10:1
current cyl vol is 500cc
diameter of cylinder is 100mm
decomp plate is 2mm

first you work out the volume that is left when the piston is at TDC.
10:1 by 500cc = 50cc

now work out the extra cylinder volume created by the decomp plate.
= area of cylinder in mm2 X height of decomp plate in mm
area of clyinder = pie X radius2 = 7853.982mm2
X2mm = 15707.964mm3 = 15.7cm3

now we know the increase in cylinder volume we can calculate the new compression ratio

500+15.7 : 50
becomes 51.57 : 5
becomes 10.314 : 1

easy as that

 

[Munkul]

Cheers jug, although the decomp plate lowers the CR, not raises I'm sorted now anyway.

 

[Vimto Rolf]

where can i buy isotta seats?

 

[punto_matt]

http://www.isottashop.com/store/

Or go buy some proper buckets.

 

[dave]

or go buy some proper buckets.

 

[punto_matt]

Thats a red cross dave.

 

[dave]

Thats a red cross dave.

not on my puter it aint

 

[Vimto Rolf]

http://www.isottashop.com/store/

Or go buy some proper buckets.

nah the seat section of their shop dont work. thats why i asked.

see piccy:


whose bucket seats you got in mind matt?

 

[jug]

Cheers jug, although the decomp plate lowers the CR, not raises I'm sorted now anyway.

WTF i added the extra volume to the wrong side of the equation at the end there

should have said:

500 : 50+15.7
becomes 500 : 65.7
becomes 7.61:1

 

[punto_matt]

nah the seat section of their shop dont work. thats why i asked.

see piccy:
View attachment 60929

whose bucket seats you got in mind matt?

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=ROAD&pcode=OMPHA730BLK

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=ROAD&pcode=OMPHA741B

 

[dannygp]

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=ROAD&pcode=OMPHA730BLK

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=ROAD&pcode=OMPHA741B

Be a noob and loose the back seats....dont have to give lifts

 

[Vimto Rolf]

i just like the look of the cobra daytona, recarro cross speed, momo nr51 and isotta daytonas

 

[Tris Harris]

Recaro's FTW :slayer:

i have a set of nice Cobra's in my bedroom though

 

[Munkul]

WTF i added the extra volume to the wrong side of the equation at the end there

should have said:

500 : 50+15.7
becomes 500 : 65.7
becomes 7.61:1

thats more like it i didnt know where you had went wrong but was too tired to work it out...

 

[Adrian Bravo]

Is the price on ePer Fiat dealers cost or sell?
Either way im being ripped off but need to know so i can be a smart arse

 

[dave]

Is the price on ePer Fiat dealers cost or sell?
Either way im being ripped off but need to know so i can be a smart arse

our eper an most on the net are old so prices are out of date

 

[Adrian Bravo]

our eper an most on the net are old so prices are out of date

Cost or sell though?

 

[maddogmorg]

do i buy two mgb engines and gearboxes on ebay which have been left in a field for 5 years!! for 99p just to take apart and reassemble for experience, also to play around with (mods) bearing in mind they'll probably never be run again but may prove usefull for parts if i do get an mgb....?

yay or nay?