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Author: Subject: Front shock poundage - Zetec/MK
Daz1234

posted on 14/9/18 at 04:27 PM Reply With Quote
Front shock poundage - Zetec/MK

Hi all

Got some second hand Protech shocks - they cam with springs with '300' written on them.

Can sits a bit too low (about 75mm at mo) and you can 'lift' the front about 2" - so think I need some heavier springs.

Before I order some im not sure what - eg 325, 350 etc and wondered what others running a Zetec are using?

Thanks

Doug

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40inches

posted on 14/9/18 at 04:54 PM Reply With Quote
I am still using the BEC springs with the Jag V6 engine, 275 lb on the front, 175 lb on the rear, working OK.
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Daz1234

posted on 14/9/18 at 05:06 PM Reply With Quote
quote:
Originally posted by 40inches
I am still using the BEC springs with the Jag V6 engine, 275 lb on the front, 175 lb on the rear, working OK.


well im using 300 on the front and not ok for me, but thanks.

Back is fine....

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Daz1234

posted on 14/9/18 at 05:18 PM Reply With Quote
quote:
Originally posted by 40inches
I am still using the BEC springs with the Jag V6 engine, 275 lb on the front, 175 lb on the rear, working OK.


Whats your ride height at the front?

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Mr Whippy

posted on 14/9/18 at 05:38 PM Reply With Quote
Stupid question but have you wound the spring seats up and if so are the springs coil bound once the car is at the ride height you want or does it still have have some travel?

I mind on my MK I had the protech shocks and springs for the Sierra engine but they coped no bother with the heavier Ford capri v6

[Edited on 14/9/18 by Mr Whippy]

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40inches

posted on 14/9/18 at 06:10 PM Reply With Quote
quote:
Originally posted by Daz1234
quote:
Originally posted by 40inches
I am still using the BEC springs with the Jag V6 engine, 275 lb on the front, 175 lb on the rear, working OK.


Whats your ride height at the front?


Around 110mm with the front wishbones parallel to the ground, rear 140mm with the wishbones parallel.
What can i say? Works fine no bottoming or any untoward behavior, if there was I would change them

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40inches

posted on 14/9/18 at 06:30 PM Reply With Quote
quote:
Originally posted by Mr Whippy
Stupid question but have you wound the spring seats up and if so are the springs coil bound once the car is at the ride height you want or does it still have have some travel?

I mind on my MK I had the protech shocks and springs for the Sierra engine but they coped no bother with the heavier Ford capri v6

[Edited on 14/9/18 by Mr Whippy]


Just popped into the garage for a sanity check
The springs have 12 coils with a 7mm gap between coils, that gives 84mm of travel. The shocks have 100mm of travel,
with the bones parallel to the ground the shocks have 75mm of compression with 25mm of droop. That gives me 7mm spare with the bump stop full compressed. I think

[Edited on 14-9-18 by 40inches]

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Daz1234

posted on 14/9/18 at 07:16 PM Reply With Quote
When the car is 'resting' the bones do not sit level they are sagging (indicating the springs are not up for the job?).

Mine is siting about 70mm off the ground (too low for my liking!)

Settings:

8 coils

about 11mm gap between coils

Wound up about 30mm

PS this is a IndyRR

PPS maybe the issue is that mine are 8 coild not 11!?

D

[Edited on 14/9/18 by Daz1234]

[Edited on 14/9/18 by Daz1234]

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Mr Whippy

posted on 14/9/18 at 07:54 PM Reply With Quote
Well those sound like the springs I had as they too had 12 turns. The way I'd look at it is if you adjust it till the car is the correct ride height i.e the lower wishbones are level as are the trackrods and when you then load up the front and it still has a bit more travel then no issue. However how much is enough depends on what your doing with it... Normally maybe 50mm would be sufficient, depends on how many potholes or speedbumps you have. However I was not aware of 8 coils springs and they may be a better option, springs are usually not very expensive.
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Daz1234

posted on 14/9/18 at 08:02 PM Reply With Quote
quote:
Originally posted by Mr Whippy
Well those sound like the springs I had as they too had 12 turns. The way I'd look at it is if you adjust it till the car is the correct ride height i.e the lower wishbones are level as are the trackrods and when you then load up the front and it still has a bit more travel then no issue. However how much is enough depends on what your doing with it... Normally maybe 50mm would be sufficient, depends on how many potholes or speedbumps you have. However I was not aware of 8 coils springs and they may be a better option, springs are usually not very expensive.


Ok well I can wind them up a bit further to get it level (as you say).....

Whats the best way to 'load up the front' bar jumping on the front of the car lol

D

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CosKev3

posted on 14/9/18 at 08:03 PM Reply With Quote
Indy R/RR have in-board shocks that work on a totally different angle to the old Indy like 40inches that has out board shocks.

Are you sure you bought shocks that were correct for a RR with in-board shocks?

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Daz1234

posted on 14/9/18 at 08:04 PM Reply With Quote
Yes mate they came off a IndyRR BEC

D

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scimjim

posted on 14/9/18 at 08:04 PM Reply With Quote
quote:
Originally posted by 40inchesThe springs have 12 coils with a 7mm gap between coils, that gives 84mm of travel.


No it doesn’t

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CosKev3

posted on 14/9/18 at 08:05 PM Reply With Quote
quote:
Originally posted by 40inches
quote:
Originally posted by Mr Whippy
Stupid question but have you wound the spring seats up and if so are the springs coil bound once the car is at the ride height you want or does it still have have some travel?

I mind on my MK I had the protech shocks and springs for the Sierra engine but they coped no bother with the heavier Ford capri v6

[Edited on 14/9/18 by Mr Whippy]


Just popped into the garage for a sanity check
The springs have 12 coils with a 7mm gap between coils, that gives 84mm of travel. The shocks have 100mm of travel,
with the bones parallel to the ground the shocks have 75mm of compression with 25mm of droop. That gives me 7mm spare with the bump stop full compressed. I think

[Edited on 14-9-18 by 40inches]


Have you taken into consideration the angle the shocks are on?

They hardly compress as they are at such a large angle compared to how much the chassis does

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CosKev3

posted on 14/9/18 at 08:05 PM Reply With Quote
quote:
Originally posted by Daz1234
Yes mate they came off a IndyRR BEC

D


Just wind the seats up more

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Daz1234

posted on 14/9/18 at 08:07 PM Reply With Quote
quote:
Originally posted by CosKev3
quote:
Originally posted by Daz1234
Yes mate they came off a IndyRR BEC

D


Just wind the seats up more


ok ill give that a go tomorrow to the point where the bones are level and see what travel that leaves me with and report back here - thanks guys.

D

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Daz1234

posted on 14/9/18 at 08:41 PM Reply With Quote
Well just wound them up as far as I think they should go (gap between coils is 8mm now) - it’s made bugger all different to the ride height though. :/
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INDY BIRD

posted on 14/9/18 at 09:08 PM Reply With Quote
If a Indy rr check push rod you may have 12.5” long

May require new ones at 14” long

Sean

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Mr Whippy

posted on 14/9/18 at 09:10 PM Reply With Quote
Ok next stupid question... I assume your wishbones bushes are not binding and they move easily by hand? If so then only options are then to get stronger springs or bigger wheels
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CosKev3

posted on 14/9/18 at 10:33 PM Reply With Quote
quote:
Originally posted by Daz1234
Well just wound them up as far as I think they should go (gap between coils is 8mm now) - it’s made bugger all different to the ride height though. :/


Take a pic

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Daz1234

posted on 14/9/18 at 10:58 PM Reply With Quote
Nothing is binding, rods are fine.

I just think I need stronger springs.... these are off a IndyRR BEC, so nothing wrong with them bar they cant handle the weight of the front end.

But the question is - they are currently 300, is anyone else running indyRR with zetec (or car engine) and if so what springs are they running.

Do I get 325, 350 375 etc.

Ta!

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Daz1234

posted on 14/9/18 at 10:59 PM Reply With Quote
quote:
Originally posted by INDY BIRD
If a Indy rr check push rod you may have 12.5” long

May require new ones at 14” long

Sean


Hey Sean

What front springs are you running? What length and what weight please?

D

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40inches

posted on 15/9/18 at 12:37 AM Reply With Quote
quote:
Originally posted by Daz1234
quote:
Originally posted by INDY BIRD
If a Indy rr check push rod you may have 12.5” long

May require new ones at 14” long

Sean


Hey Sean

What front springs are you running? What length and what weight please?

D


Sean should know, as I believe he is one of the new owners of MK Sports cars

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Daz1234

posted on 15/9/18 at 09:46 AM Reply With Quote
quote:
Originally posted by INDY BIRD
If a Indy rr check push rod you may have 12.5” long

May require new ones at 14” long

Sean



OK just got the tape measure out and yes the rods are 12.5" long - so they should be 14"? That would explain it......


[Edited on 15/9/18 by Daz1234]

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CosKev3

posted on 15/9/18 at 05:54 PM Reply With Quote
quote:
Originally posted by Daz1234
quote:
Originally posted by INDY BIRD
If a Indy rr check push rod you may have 12.5” long

May require new ones at 14” long

Sean



OK just got the tape measure out and yes the rods are 12.5" long - so they should be 14"? That would explain it......


[Edited on 15/9/18 by Daz1234]


Mounting point to mounting point is where they measure them

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