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Home > Help Needed / General Tech Chat > Supercharger Basic Setup - Questions

JonnyAlpha

11 Posts
Member #: 12124
Member

South West

Hi,

I am building a 1310 from a 1275 A+ pulled from a 1989 Mk2 Metro and am contemplating adding a Supercharger.
Current spec:
1310
Hepolite 8cc Dish Pistons
4.5 Deck Height
AC RS Camshaft
AC 1.3 Zero Tolerance Rockers (or at least when I get them)
Metro Electronic Dizzy (Will be re-curved for this cam)
MED ST1 Lightened Flywheel and Clutch Kit
Facet Electronic Fuel Pump
Malpassi Fuel Regulator

The reason for this is that I picked up a Weber DCOE 45 and rather than hide it away in the Bulkhead, having it sticking out of the front of a Supercharger (a) looks a whole lot better and (b) will improve performance © I love challenges and love learning.

Proposed setup:

Weber DCOE 45
SH Eaton M45 or similar (whatever similar is)
DIY Kit https://vmaxscart.com/products/a-new-diy-su...=41285165777056

I believe the Eaton will push out 10PSI and the target CR I have been advised should be 8.5:1

Questions:
1. How do you attached the tensioner pulley? I have seen people modifying Timing Chain Cases?
2. Where / what type of multi Vee belt would I need?
3. DO you need to change the Alternator and Water Pump Pulleys?
3. To monitor the performance of the Supercharger / Fuel Mixture do I need some form of gauge?
4. What PSI setting should the fuel regulator be for this carb on a suck through SC?
5. Do I need 2 x BK450 Head Gaskets with the Compression Plate?

That'll do for now *smiley*



Speed is just a question of money, so, how fast do ya wanna go?


shane

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2514 Posts
Member #: 1246
Post Whore

Lowestoft, Suffolk.

Hi,

1, tensioner pulley would be better mounted off of a solid surface such as the block or incorporated with something on the front of the block with a substantial fixing. the position of the tensioner will be dictated by pulley sizes and belt length whilst navigating anything else in the vicinity.

2, Vee belt length will be determined by factors mentioned above. ideally the belt needs to be as wide as possible for grip under load.

3, If you are driving the supercharger, alternator and water pump all off of the same belt then yes you need to change the pulleys to Vee type ones.

3, A Wide band lambda gauge is advisable.

4, This I cannot answer as have no experience.

5, A decompression plate is a bit of a bodge, to use one you'd require 2 BK450's. The preferred method to reduce CR is CC's in the pistons and cylinder head, With the block being 1310 you'll need to gain more CC's to overcome the higher swept volume.

Is your deck height in .000"?

As a side note I suggest ditching the dizzy in favour of Mapable ignition such as megajolt as its so much more versatile and easily more tunable.

Shane


Yo-Han

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940 Posts
Member #: 3228
Post Whore

North of the Netherlands

Did you check the YT video's as suggested in the VMAX add?

1. For suck through most tensioners are attached to the SC
2. Measure the length with a piece of string and order one at the local car parts store, they can find a suitable one,
3. I think VMAX uses the bottom pulley with multi-V and ordinairy mini V combined in 1.
3. As Shane says; get a Wide band.
4. Not sure either what normal setting would be for Weber.
5. As per Shane's remarks and advice.

Consider Shane's advice regarding mapable ignition.

Han

Dazed and Confused....


JonnyAlpha

11 Posts
Member #: 12124
Member

South West

On 6th Nov, 2021 shane said:
Hi,

Is your deck height in .000"?



Yes sorry 0.0045" Deck Height (4 1/2 Thou)

Speed is just a question of money, so, how fast do ya wanna go?


JonnyAlpha

11 Posts
Member #: 12124
Member

South West




On 8th Nov, 2021 Yo-Han said:
Did you check the YT video's as suggested in the VMAX add?

Han


The video is missing, I asked Stuart, he said he is editing it.

Speed is just a question of money, so, how fast do ya wanna go?


JonnyAlpha

11 Posts
Member #: 12124
Member

South West

Thanks for the response, things are starting to get a little clearer.

I have been communicating with Stuart Garr (Vmaxscart) and Turbo Phil Dawe.

Stuart suggested that an M62 is what I should be looking for, however I believe it will need modifying to accept a Weber DCOE on the end. Can't find any info on this and if the tensioner pulley also needs mounting on it I need some info on that also.

Speed is just a question of money, so, how fast do ya wanna go?


shane

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2514 Posts
Member #: 1246
Post Whore

Lowestoft, Suffolk.


I assume your talking to Phil re a head?
your going to need to have 28cc+in the chambers to get the CR anywhere near sensible to loose the decompression plate.

Shane

On 9th Nov, 2021 JonnyAlpha said:
On 6th Nov, 2021 shane said:
Hi,

Is your deck height in .000"?



Yes sorry 0.0045" Deck Height (4 1/2 Thou)


shane

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2514 Posts
Member #: 1246
Post Whore

Lowestoft, Suffolk.


If the M62 has a bolt on flange on the inlet end of the blower it shouldn't be too hard to make an adaptor. DCOE flanges are available off of the shelf.

Shane

On 9th Nov, 2021 JonnyAlpha said:
Thanks for the response, things are starting to get a little clearer.

I have been communicating with Stuart Garr (Vmaxscart) and Turbo Phil Dawe.

Stuart suggested that an M62 is what I should be looking for, however I believe it will need modifying to accept a Weber DCOE on the end. Can't find any info on this and if the tensioner pulley also needs mounting on it I need some info on that also.


JonnyAlpha

11 Posts
Member #: 12124
Member

South West




On 9th Nov, 2021 shane said:

I assume your talking to Phil re a head?
your going to need to have 28cc+in the chambers to get the CR anywhere near sensible to loose the decompression plate.

Shane



I am doing the head myself, but have asked Phil a couple of questions about chamber size. I am going to have extreme difficulty getting anywhere near 28cc in the chamber, unless I can work out a chamber profile that will achieve it.



Speed is just a question of money, so, how fast do ya wanna go?


JonnyAlpha

11 Posts
Member #: 12124
Member

South West




On 9th Nov, 2021 shane said:

If the M62 has a bolt on flange on the inlet end of the blower it shouldn't be too hard to make an adaptor. DCOE flanges are available off of the shelf.

Shane

On 9th Nov, 2021 JonnyAlpha said:
Thanks for the response, things are starting to get a little clearer.

I have been communicating with Stuart Garr (Vmaxscart) and Turbo Phil Dawe.

Stuart suggested that an M62 is what I should be looking for, however I believe it will need modifying to accept a Weber DCOE on the end. Can't find any info on this and if the tensioner pulley also needs mounting on it I need some info on that also.



I have been advised by Stuart to get an M62 as opposed to an M45, however looking at M62's I can't see that it has a removeable flange?

Attached is a pic of an M62 and one of Stuart's DCOE setups to compare.


Attachments:

Speed is just a question of money, so, how fast do ya wanna go?


shane

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2514 Posts
Member #: 1246
Post Whore

Lowestoft, Suffolk.

you can see on the second picture where the flange has been welded on.

Shane


JonnyAlpha

11 Posts
Member #: 12124
Member

South West

OK so here's what I have found out so far.

The SC I need is an Eaton M65 not a 62 (pic attached) the one I referred earlier in the thread.
This will need the end chopped off, new bearings and a flange welded on - which come in the DIY kit from Xmaxscart
I believe I will also have to modify the chain case by removing the breather as it will foul the multi vee belt.

Chamber size and decompression plate to to matched to achieve a CR of 8.5:1 allowing me to run 10PSI boost. With a 3cc decompression plate, I need 22.5cc in the head, with a 6cc decompression plate, I need 22.05cc in the head - all very doable. Screenshots attached.

Questions:

1. A guy on TMF suggested that his friend fitted a decompression plate and then found that the head studs weren't long enough and that the bonnet would not close? Any thoughts on this?

2. Hows does not having this breather effect the engine pressure, do you need to fit a breather elsewhere?

3. Someone has also suggested that the Gearbox needs strengthening? Not sure where or what he meant - maybe a Cross Pin Diff? I have rebuilt the gearbox and John Guess did the Diff with a Molybdenum Pin.





Speed is just a question of money, so, how fast do ya wanna go?

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