mattjhunt
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| posted on 29/3/08 at 07:15 PM |
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Rebore of 1600 crossflow
I've got an old 1600 711m crossflow engine I'm bringing back to life. Thinking I should get it rebored (to 1760cc?).
How much would this cost, and any ideas who to go to in the Oxfordshire area?
Also, is this a good idea? All crossflows on ebay seem to have been done....
cheers
[Edited on 29/3/08 by mattjhunt]
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rusty nuts
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| posted on 29/3/08 at 07:33 PM |
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Suspect with it bored out to give you 1760cc you will end up with porous/ weak cylinder bores . IIRC the block that will bore out that big is the AX
block? which tend to be megabucks. My 711m block is bored out 30thou and still puts out 127BHP and will pull from 1500 rpm in 5th gear. The popular
engine is the so called 1700 which is 90thou oversize and gives 1690cc Check the casting number on the side of the block , it will be T ?? The higher
the T number the thicker the bore walls are supposed to be T 20 being the highest number
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RichieW
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| posted on 29/3/08 at 07:43 PM |
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I'd rebore it the minimum you can get away with so in future if the cylinders wear again you can freshen it up with a further rebore and
rebuild. If you rebore it out to the max on the first go you are left with nowhere to go other than having it relinered.
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gazza285
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| posted on 29/3/08 at 08:35 PM |
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quote:
Originally posted by rusty nuts
T 20 being the highest number
I've got a T22
DO NOT PUT ON KNOB OR BOLLOCKS!
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Thinking about it
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| posted on 29/3/08 at 08:45 PM |
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I have been quoted £70 plus vat by a local guy who does a lot of classic car engine rebuilds. And £50 plus vat at an engine re conditioners I have no
experience of. Prices are for bore and hone. It's the cost of the pistons and rings which is the expensive bit.
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hissingsid
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| posted on 29/3/08 at 09:39 PM |
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Try Oselli in Witney. Seem to be fair prices and local to you I guess!
They were tinkering with Crossflows since they came out!
I'll be sending my 1300 there when I get round to engine rebuilding!
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nitram38
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| posted on 29/3/08 at 10:17 PM |
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Any of you guys used 1300gt pistons in a 1600?
I remember rebuilding my 1600 crossflow in my anglia (originally built by Ron Harris racing) after I blew it up a couple of times.
The 1300 piston has a smaller cup and therefore increases the compression ratio.
Gives a bit more power with relatively little cost.
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gazza285
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| posted on 29/3/08 at 10:29 PM |
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Smaller cup, but a heavier piston because of it ok for mild performance gains.
DO NOT PUT ON KNOB OR BOLLOCKS!
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nitram38
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| posted on 29/3/08 at 10:40 PM |
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quote:
Originally posted by gazza285
Smaller cup, but a heavier piston because of it ok for mild performance gains.
I think Ron used to modify them and rebalance them
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rusty nuts
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| posted on 30/3/08 at 12:42 AM |
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quote:
Originally posted by gazza285
quote:
Originally posted by rusty nuts
T 20 being the highest number
I've got a T22
I did say IIRC but my memory is not what it was.
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gazza285
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| posted on 30/3/08 at 12:47 AM |
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quote:
Originally posted by rusty nuts
I did say IIRC but my memory is not what it was.
And I said .
DO NOT PUT ON KNOB OR BOLLOCKS!
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brynhamlet
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| posted on 30/3/08 at 06:18 AM |
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Talk to Newark Engines at Sutton on Trent.
Unit 2 Gardners Court, Old Great North Rd, Sutton-on-Trent, Newark, Nottinghamshire NG23 6QS
Tel: 01636 822614
He built my engine -
Formula Ford bottem end, i.e. 1800cc, balanced crank, lightened flywheel, etc. Gas flowed head converted to unleaded.
He has all the facilities to do what you want within your budget.
I got an excellant engine, built from scatch which is seriously quick from them.
Oh and when you look at their workshop facilities and talk to them you will undersand that they can deliver
[Edited on 30/3/08 by brynhamlet]
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thepest
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| posted on 30/3/08 at 06:49 AM |
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If of any help, I used the fiat 2 Liter Pistons, they are flat top not a bowl. CC of 1740. I know that it may sound strange to use a flat head and a
flat piston but it surprisingly works on the crossflow really well. You would need to re-bore the connecting rod gudgeon pins to suit the fiat piston.
The fiat piston is light and I have been running 10.5:1 comp with no problems.
I'm not a pioneer in this field, here in malta all crossflow tuners do this.
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jollygreengiant
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| posted on 30/3/08 at 11:17 AM |
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Yep I'd agree with this. When I rebuilt my 1600 into a screamer in '79/80, I went to 1662cc by using Powermax Lotus twin cam piston. Had
these machined down flat, then deck heighted the block for a 10.5/11.0:1CR and used a flat full race head with a mild race cam. All the bottom end
lightened and balanced. With twin 40's and a piper ladder rocker gear, all nestle in a Mk1 Cortina. With a 3.7 diff it would pull clean in top
right up to 8k RPM. 30 to the gallon on a run and very slightly quicker than a 2.8I capri. 
quote:
Originally posted by thepest
If of any help, I used the fiat 2 Liter Pistons, they are flat top not a bowl. CC of 1740. I know that it may sound strange to use a flat head and a
flat piston but it surprisingly works on the crossflow really well. You would need to re-bore the connecting rod gudgeon pins to suit the fiat piston.
The fiat piston is light and I have been running 10.5:1 comp with no problems.
I'm not a pioneer in this field, here in malta all crossflow tuners do this.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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David Jenkins
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| posted on 30/3/08 at 12:12 PM |
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I have a rebored x-flow, and I do like it very much. but I wouldn't spend significant money on it any more.
If it fails for any major reason then I'll probably whip it out (ooer!) and stuff a Zetec in there, or maybe a 4-AGE if I can find a cheap
enough one (The Toyota 4-AGE is a reasonably modern engine that's not a lot bigger than the x-flow, and a lot more powerful straight out of the
box).
There is the law of diminishing returns to consider...
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david walker
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| posted on 30/3/08 at 08:11 PM |
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Quote
"Formula Ford bottem end, i.e. 1800cc, balanced crank, lightened flywheel, etc. Gas flowed head converted to unleaded."
So that would be an illegal FF1600 then eh? Dodgy outfit that talks ......!
FF1600 engines are 1600cc, are not gas flowed and don't have lightened flywheels!
How do you get a 1600 X'Flow out to 1800cc? - In LOCOST fashion? Using largest available std type pistons, ie +90thou, they go to 1690cc, often
referred to as 1700.
+1mm Lotus piston at 83.5mm is about all it's SAFE to take a std type 711m block out to.
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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MikeRJ
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| posted on 30/3/08 at 10:31 PM |
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quote:
Originally posted by nitram38
Any of you guys used 1300gt pistons in a 1600?
I bought a brand new set of +90 1300 pistons and rings, and then found out my 1600 (711M) block had been linered and wasn't capable of being
bored out.
[Edited on 30/3/08 by MikeRJ]
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