flak monkey
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 posted on 22/4/06 at 09:55 AM |
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2 engine questions
In my quest to make a decent engine for as little money as possible I have a couple of questions:
1. Would a Kent RL2 cam be too much on a pinto running on a 38DGAS carb with flowed head and reasonably std bottom end?
2. Are ARP conrod bolts a must have? And if fitted do the big end tunnels have to be resized?
Cheers,
David
Sera
http://www.motosera.com
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mookaloid
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| posted on 22/4/06 at 11:04 AM |
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1. I suspect it would be too much. go for a FR 32 or similar.
2. no need for arp bolts
Cheers
Mark
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flak monkey
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| posted on 22/4/06 at 03:02 PM |
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Cheers Mark. 
I assume the std conrod bolts are fine upto the limit of the conrods/pistons then? (7300rpm ish)
Anyone got anything useful to add? 
Cheers,
David
[Edited on 22/4/06 by flak monkey]
Sera
http://www.motosera.com
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mookaloid
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| posted on 22/4/06 at 03:19 PM |
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Which engine are you starting with? is it an injection engine?
The injection bottom end should be ok up to your rev limit - I take mine up to 7500 in bursts and hasn't let go yet
What sort of power are you after? The 38 DGAS will be ok up to about 150BHP and probably wont want to go much over 7000 anyway.
If you do your own head work you can keep the cost reasonable but you might want to skim the head to raise the compression ratio a bit.
Cheers
Mark
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flak monkey
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| posted on 22/4/06 at 03:24 PM |
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The engine was carbed. But is a 1988 205 block engine and has the widebeam rods in as all the injection engines had.
I will be more than happy with 140-150bhp
I am in the process of doing my own head work at the moment its not finished yet though. (Std sized valves but flowed ports)
The std compression ratio is just over 9:1 if i remember rightly. I have read 10:1 is a good ratio to go for though?
David
Sera
http://www.motosera.com
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mookaloid
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| posted on 22/4/06 at 04:01 PM |
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yep - go for it - should be fine
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flak monkey
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| posted on 22/4/06 at 04:02 PM |
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Whats your engine putting out these days Mark?
Sera
http://www.motosera.com
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Mike R-F
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| posted on 22/4/06 at 04:15 PM |
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If you (or anyone else) are thinking of using the 38 DGAS, speak to John Wade of John Wade Developments in Wolverhampton. John can get more power out
of a 38 DGAS than just about anyone & his prices are really reasonable.
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mookaloid
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| posted on 22/4/06 at 04:40 PM |
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quote:
Originally posted by flak monkey
Whats your engine putting out these days Mark?
About 150bhp at the wheels. say 180+ at the flywheel.
Jacko has done some stuff to his recently and got 140 at the wheels which is pretty good - he has done his own cylinder head I believe.
Cheers
Mark
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DarrenW
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| posted on 24/4/06 at 03:49 PM |
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Ive used the Fr32. It ticks over nicely and apart from never being set up properly yet it seems to rev OK. Im hoping to release some more
'hosses' with megajolt and bike carbs soon. Following that it will need good RR tune.
I ported my own head probs same as you are doing David (Des Hammill book). To be honest i didnt take as much off as he suggests but did start with
injection head. I had 40thou skimmed off it. Im running 18deg advance at the mo - it ran well on the track but pinks a bit when cold. Im going to back
it off and see if that helps. Ive only set up the fuelling with a colour tune but am convinced its a little rich.
Fully balancing the bottom end seems to pay big dividends, especially with lightened flywheel. Ive already looked into the costs of this from
Mookaloids engine builder who is very reasonable.
Marks 180+ engine is an unbelievable lump. Certainly wet my appetite for some mods.
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James
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| posted on 24/4/06 at 04:06 PM |
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Something about it on the Puma Racing site:
http://www.pumaracing.co.uk/pinto.htm
HTH,
James
[Edited on 24/4/06 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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flak monkey
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| posted on 24/4/06 at 04:59 PM |
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I have just got hold of an FR22 for £50 (the predecessor to the FR32 i believe? - the specs are almost identical on the kent website. 0.18mm lees lift
and 10deg less duration on inlet, but 5 more on exhaust)
Instead of getting the head skimmed I may just fit a felpro head gasket which is only 1mm thick, so raises the compression ratio to about 9.8:1 if i
remember correctly.
I am working to the Hamill book, only doing the modifications he suggests for standard valve sizes (valve throat and short turn mods only).
Sera
http://www.motosera.com
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