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| Home > Help Needed / General Tech Chat > Centre main bearing strap? yay or nay | |||||||
 159 Posts Member #: 1997 Advanced Member Lichfield |
11th Dec, 2007 at 07:25:05pm
Hi, im building a 150hp turbo engine and i wondered if its worth while getting a centre main strap fitted? since it will be pounding the mains a bit more?
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
11th Dec, 2007 at 07:33:50pm
Well, supposedly it isn't needed on a non high revving engine. Than again it's cheap and easy to do... On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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159 Posts Member #: 1997 Advanced Member Lichfield |
11th Dec, 2007 at 07:38:24pm
well i got the engine sent off for machining and forgot to send the main cap so im wondering weather to bother sending it to get it done or not. |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
11th Dec, 2007 at 07:57:17pm
It's hard to say really.. Whatever you decide you'll be OK. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
11th Dec, 2007 at 08:42:00pm
If you do go for one go for one with decent bolts, imo a centre strap with cheap bolts is worse than no centre strap. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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 6549 Posts Member #: 1149 #1 Basshunter Fan Force Racing ICT Dept Manager Miglia Turbo Am frum Yokshyer tha noes! |
12th Dec, 2007 at 10:01:21am
Cheap enough to do! Like the lads say get the right bolts, am i right in thinking the bolts have 5 dashes on the top? 1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.
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 7265 Posts Member #: 1268 The Boom Boom speaker Police! Essex |
12th Dec, 2007 at 10:54:28am
I would do it,
In the 13's at last!.. Just |
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 6274 Posts Member #: 509 Post Whore Isle of Man |
12th Dec, 2007 at 12:38:36pm
just get somone local to mill the cap flat, the strap should cost about 60p its only a bit of steel. "Turbo's make torque, and torque makes fun"
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
12th Dec, 2007 at 01:39:02pm
Have anyone properly measured the cap size after such a mill and fitment? The hole is bound to change, but how much? I'm about to line hone the block for my new engine build as the bearing had "rubbed" in the bore. I'll do some measuring.
On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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Forum Mod  5933 Posts Member #: 784 9 times Avon Park Class C winner Milton Keynes |
12th Dec, 2007 at 05:37:25pm
The hole does change shape. Selby line bores after fitting a strap.
I seriously doubt it! |
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 368 Posts Member #: 806 Senior Member Cirencester, Gloucestershire |
12th Dec, 2007 at 07:38:07pm
i did mine myself on the lathe no problems. been up to 6500rpm on the road and 7500 on the rollers
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 1913 Posts Member #: 1392 Pointless Post Whore Liverpool, North west |
13th Dec, 2007 at 12:25:39am
On 12th of Dec, 2007 at 07:38pm Leonard said:
i did mine myself on the lathe no problems. On the mill i should think. Back once again like a renegade master |
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Site Admin  15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
13th Dec, 2007 at 12:42:35am
On 12th of Dec, 2007 at 01:39pm Vegard said:
Have anyone properly measured the cap size after such a mill and fitment? The hole is bound to change, but how much? I'm about to line hone the block for my new engine build as the bearing had "rubbed" in the bore. I'll do some measuring. I'm thinking that the strap fitment isn't as easy as it seems. Vegard has a point, I had a centre main strap fitted to the block I now have in my car, and it caused the centre main to "spring" and locked up the crank........ I ended up having it line bored to cure it, and a 4 bolt main cap fitted at the same time.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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368 Posts Member #: 806 Senior Member Cirencester, Gloucestershire |
13th Dec, 2007 at 07:30:08pm
On 13th of Dec, 2007 at 12:25am minimadj said:
On 12th of Dec, 2007 at 07:38pm Leonard said:
i did mine myself on the lathe no problems. On the mill i should think. vertitcal slide on the lathe
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 4360 Posts Member #: 1459 En-suite user Braintree, Essex |
13th Dec, 2007 at 08:14:03pm
It would take awhile, but will a surface grinder do the job? On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish. On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood. Been neglecting Turbo'd 'A' series.............. |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
13th Dec, 2007 at 10:57:34pm
It would do the job... In about a fortnight. Get a grinder. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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