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Post by scottydugg on Jun 3, 2019 18:53:43 GMT
So it looks like the mazdaspeed engine is just a stock engine with a badge.... Fantastic.
So instead I'm looking to fit a mk2 head onto a mk1. I've sourced everythi g I think I need: head assembly, inlet, injectors.
From what I can tell I need to use the mk1 CAS and throttle body. So I'll need a new inlet and exhaust gasket, plus a new head gasket.
Is there anything I've missed?
Anyone done this before and have a rough idea of the gains?
If swapping the head anything else I should do? Plugs, leads, oil all changed recently.
I'm not expecting huge gains in anything, but I like tinkering and this is cheap. A supercharger, turbo, engine swap isn't on the cards for a king time.
Thanks guys,
Scott
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Post by Zed. on Jun 3, 2019 19:37:41 GMT
So it looks like the mazdaspeed engine is just a stock engine with a badge.... Fantastic. If swapping the head anything else I should do? Plugs, leads, oil all changed recently. mazdaspeed badge on camcover? ^^ easily swapped  as to the head, if it's off then a cleanup (dishwasher  ) and re-seat the valves as that something that costs nothing to do (time) but can make a diference  Rich. |
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Post by scottydugg on Jun 3, 2019 19:47:26 GMT
So it looks like the mazdaspeed engine is just a stock engine with a badge.... Fantastic. If swapping the head anything else I should do? Plugs, leads, oil all changed recently. mazdaspeed badge on camcover? ^^ easily swapped as to the head, if it's off then a cleanup (dishwasher ) and re-seat the valves as that something that costs nothing to do (time) but can make a diference Rich. Original engine was taken out as rings were past it. We weren't sure if it was a special engine or just cams. But tracked down a previous owner who had the head off and said its a stock engine with the badge on the cam cover and rear panel. We haven't split it yet, but I'm both glad and dissapointed as I don't have the money to refurb an entire engine. Is it worth getting the new to me, mk2 head skimmed? And lapping the valves before putting it in? |
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Post by Zed. on Jun 3, 2019 20:00:27 GMT
never say never, strip it & measure, sometimes theres little suprises hidden away  as to a skim etc. I'd do it but thats my opinion.............. also, after a skim the camshaft timing will retard slightly, possibly not noticable BUT this can be an extreme case where the performance suffers - time for either adjustabl (so called 'vernier') pulleys OR file the slots in the pulley's to allow the cams to advance to spec  Rich. |
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Post by Whistler on Jun 3, 2019 20:04:17 GMT
So it looks like the mazdaspeed engine is just a stock engine with a badge.... Fantastic. So instead I'm looking to fit a mk2 head onto a mk1. I've sourced everythi g I think I need: head assembly, inlet, injectors. From what I can tell I need to use the mk1 CAS and throttle body. So I'll need a new inlet and exhaust gasket, plus a new head gasket. Is there anything I've missed? Anyone done this before and have a rough idea of the gains? If swapping the head anything else I should do? Plugs, leads, oil all changed recently. I'm not expecting huge gains in anything, but I like tinkering and this is cheap. A supercharger, turbo, engine swap isn't on the cards for a king time. Thanks guys, Scott You'll need the mk2 or 2.5 inlet manifold too - the square top 2.5 is a good choice. The mk1 and mk2 ports match, but the bolt pattern is different. |
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Post by scottydugg on Jun 3, 2019 21:40:39 GMT
never say never, strip it & measure, sometimes theres little suprises hidden away as to a skim etc. I'd do it but thats my opinion.............. also, after a skim the camshaft timing will retard slightly, possibly not noticable BUT this can be an extreme case where the performance suffers - time for either adjustabl (so called 'vernier') pulleys OR file the slots in the pulley's to allow the cams to advance to spec Rich. Will strip it and see what's inside, as for the variable cams, I've done a bit of reading and maybe that's a bit too far for now. Would a light skim require them? Maybe just fit the head as is if it's in good condition?
Trying to do this on a budget 
So it looks like the mazdaspeed engine is just a stock engine with a badge.... Fantastic. So instead I'm looking to fit a mk2 head onto a mk1. I've sourced everythi g I think I need: head assembly, inlet, injectors. From what I can tell I need to use the mk1 CAS and throttle body. So I'll need a new inlet and exhaust gasket, plus a new head gasket. Is there anything I've missed? Anyone done this before and have a rough idea of the gains? If swapping the head anything else I should do? Plugs, leads, oil all changed recently. I'm not expecting huge gains in anything, but I like tinkering and this is cheap. A supercharger, turbo, engine swap isn't on the cards for a king time. Thanks guys, Scott You'll need the mk2 or 2.5 inlet manifold too - the square top 2.5 is a good choice. The mk1 and mk2 ports match, but the bolt pattern is different.
Yes managed to source the mk2 inlet mani with all the bits required for 70 quid which is pretty good I think.
Anyone a rough idea how much it'll make over standard? 10% a good estimation?
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Post by scottydugg on Jun 4, 2019 15:11:50 GMT
Been doing some additional reading, hopefully the head I've sourced is in good condition.
If it is, bar a skim and lapping the valves there isn't much else I'd want to do.
However, since I'm chasing budget N/A gains already is it worth trying the ExIntake Mod at the same time? (Edit: even more reading suggest no)
The Exhaust cam wouldn't be hard to source, it's just the information on what needs done, I've seen on Miata,net they get the cam gear drilled at a machine shop. I'm dubious of me trying to set variable cam gears as I've no experience with this.
All thoughts welcome (unless they are "go turbo/supercharge" as I don't have that kind of cash).
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Post by atlex on Jun 4, 2019 15:31:47 GMT
If your engine isn't the b-spec where the fewk did the real block & head go ?
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Post by scottydugg on Jun 4, 2019 17:11:59 GMT
flic.kr/p/2g8JAmnflic.kr/p/2g8JTaGThat's the only markings on the cams, can't split the head till next week. They just look like standard items no? (the "mazdaspeed" engine btw)
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Post by scottydugg on Jun 4, 2019 17:12:52 GMT
If your engine isn't the b-spec where the fewk did the real block & head go ? Very good question, but probably not sat in my parents garage 🤔 mystery! |
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Post by schercheeroo on Jun 5, 2019 9:59:36 GMT
Anyone a rough idea how much it'll make over standard? 10% a good estimation?
Have you read my cylinder head report? mighty5s.com/thread/3246/cylinder-headsThe figures suggest up to 20% more power. So up to 155 from 130 ish hp, if the correct supporting mods also are made. |
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Post by scottydugg on Jun 5, 2019 11:39:12 GMT
Anyone a rough idea how much it'll make over standard? 10% a good estimation?
Have you read my cylinder head report? mighty5s.com/thread/3246/cylinder-headsThe figures suggest up to 20% more power. So up to 155 from 130 ish hp, if the correct supporting mods also are made. I had yes, fantastic thread btw, I'll probably need to go a re-read it now. I gather supporting mods are: intake/exhaust/inlet porting. I'll be running the mk2 inlet manifold and not the flat top mk2.5. Doing some reading on the ExIntake mod, I'd be interested to see if this would add any benefits to an N/A tuning setup. From what I've read it wouldn't benefit a boosted setup as it would have too much overlap? Or would a head skim give better results for just plug and play. |
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Post by mrwallace on Jun 5, 2019 11:59:32 GMT
Interested to see how you get on with this... ie I'm now thinking about finding a MK2 cylinder head!  |
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Post by schercheeroo on Jun 5, 2019 12:02:52 GMT
I assume you have read this thread; forum.wscc.co.uk/forum/topic/104287-exhintake-camshaft-modification-for-mx5-18-sdv-cars/The upto 20% increase figure comes from the increase in effective time area. Supporting mods would be exhaust system, compression ratio increase and ECU tuning. I can't comment on the effect on flow efficiency that changing intake manifolds has, but I very much doubt it is as significant as changing the port design and camshaft profile. |
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Post by scottydugg on Jun 6, 2019 9:33:12 GMT
Interested to see how you get on with this... ie I'm now thinking about finding a MK2 cylinder head! I've a good source that can get you one, I'll send you a PM. I assume you have read this thread; forum.wscc.co.uk/forum/topic/104287-exhintake-camshaft-modification-for-mx5-18-sdv-cars/The upto 20% increase figure comes from the increase in effective time area. Supporting mods would be exhaust system, compression ratio increase and ECU tuning. I can't comment on the effect on flow efficiency that changing intake manifolds has, but I very much doubt it is as significant as changing the port design and camshaft profile. I have read that, with how delicate it is I think a skim alone would be the best investment of money. I'll be running the stock ECU for my application. So a minimal skim with non-adjustable cam gears Looking into mild porting on the inlet manifold, lapping the valves and replacing the valve stem seals if need be. Since the car is running fine as is, I've plenty time (but no skill) to get this done. |
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) and re-seat the valves as that something that costs nothing to do (time) but can make a diference 
le sigh